The distance of a Line Segment from from one point on a circle's Circumference, Through the Center to another point on the circle's Circumference is the:

The expected value of X is 100/663.

Let's consider the sequence of 3 number cards as an individual block, then we can see that there are 10 such blocks in the deck (2-3-4, 3-4-5, ..., 9-10-J, 10-J-Q), and there are 39 non-number cards in the deck.

Now, we can consider flipping the cards one by one and keep track of the number of times we see the beginning of a new block of 3 number cards. There are 50 positions in the deck where a block of 3 number cards could begin (the first 2 cards cannot start a block and the last 2 cards cannot end a block). For each position, the probability of seeing the beginning of a new block is given by:

P(new block) = P(first card is a number) x P(second card is the next number) x P(third card is the next number) = 10/52 x 4/51 x 4/50 = 2/663

Therefore, the expected value of X is:

E(X) = P(new block at position 1) + P(new block at position 2) + ... + P(new block at position 50) = 50 x P(new block) = 50 x 2/663 = 100/663

So, the expected value of X is 100/663.

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Answer:

Step-by-step explanation:

n to the power of 6

The percentage of adult spiders that have carapace lengths exceeding a certain value is equal to the area under the standard normal curve that lies to the right of that value.

This is because the normal distribution is symmetric around its mean, and the area to the right of a certain value represents the proportion of data points that are greater than that value. Therefore, by calculating the area under the standard normal curve to the right of a certain value, we can determine the percentage of adult spiders with carapace lengths exceeding that value.

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Calculate Peter's speed in meters per second: 1256.64 meters / 480 seconds ≈ 2.618 m/s

To determine Peter's speed, first find the circumference of the circular track using the formula: C = πd. In this case, the diameter (d) is 100 meters.

C = π(100) ≈ 314.16 meters

Peter runs 4 laps in 8 minutes, which means he runs 4 * 314.16 = 1256.64 meters in 8 minutes.

Now convert 8 minutes to seconds: 8 minutes * 60 seconds/minute = 480 seconds

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Research has shown that when administering a survey, respondents who are asked questions in which they have little or no knowledge are likely to respond with inaccurate or incomplete information.

This can happen due to several reasons, such as the respondents feeling embarrassed or ashamed of admitting their lack of knowledge, or simply guessing the answer to avoid appearing uninformed. Graeff's (2003) study highlights the importance of carefully designing survey questions to ensure that they are clear and easy to understand for all respondents, regardless of their level of knowledge on the topic. It is also important to provide respondents with options such as "I don't know" or "Not applicable" to encourage honest and accurate responses. Administering surveys can be a valuable tool for gathering information, but it is crucial to consider the limitations and potential biases that may arise. Conducting thorough research and using appropriate survey methods can help to ensure that the data collected is reliable and useful for making informed decisions.

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√2 is the value of the side b.

In the given triangle from the sine rule,

sin60/a = sin90/2√2 = sin 30/b

Thus,

1/2√2 =1/2/b

b = √2

Therefore, the value of b is √2.

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The margin of error of a 95% confidence interval estimate of the population proportion of managers who have caught salespeople cheating on an expense report falls within the range of 0.222 to 0.378.

In other words, it represents the range within which the true population proportion is likely to fall.

To calculate the margin of error, we need to know the sample size, the proportion of managers in the sample who have caught salespeople cheating on an expense report, and the confidence level.

Assuming that we have a large enough sample size (at least 30) and that the sample proportion is not too close to 0 or 1.

we can use the following formula to calculate the margin of error:

Margin of error = z* (sqrt(p*(1-p)/n))

where z* is the z-score associated with the desired confidence level (in this case, 1.96 for 95% confidence).

p is the sample proportion, and n is the sample size.

For example, if we have a sample of 100 managers and 30% of them have caught salespeople cheating on an expense report.

The margin of error for a 95% confidence interval estimate would be:

Margin of error = 1.96* (sqrt(0.3*(1-0.3)/100)) = 0.078

This means that we can be 95% confident that the true population proportion of managers who have caught salespeople cheating on an expense report falls within the range of 0.222 to 0.378 (i.e., the sample proportion plus or minus the margin of error).

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As the number of flips increases from 10 to 10000, we can expect the relative frequency of the occurrence of a Head to become more stable and closer to the true probability of 0.2.

The true probability of observing a Head based on this simulation is 0.2, which means that out of 10 flips, we would expect to see 2 Heads on average. However, as the number of flips increases from 10 to 10000, we would expect the relative frequency of the occurrence of a Head to approach the true probability of 0.2.

This is because of the Law of Large Numbers, which states that as the sample size increases, the sample mean will approach the true mean. In the case of coin flipping, the more flips we make, the closer we will get to the expected proportion of Heads.

For example, if we flip the coin 100 times, we might get 30 Heads and 70 Tails, which is a relative frequency of 0.3. However, if we flip the coin 1000 times, we might get 200 Heads and 800 Tails, which is a relative frequency of 0.2. As we continue to increase the number of flips, the relative frequency will approach the true probability of 0.2.

Therefore, as the number of flips increases from 10 to 10000, we can expect the relative frequency of the occurrence of a Head to become more stable and closer to the true probability of 0.2. This is important to keep in mind when conducting any type of statistical analysis based on coin flipping or other random events.

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We would need to flip the coin 107 times to obtain a 90% confidence interval with a width of at most 0.16 for the probability of flipping a head.

To answer this question, we can use the formula for the margin of error in a binomial proportion confidence interval, which is:

Margin of Error = z*sqrt(p*(1-p)/n)

Here, z is the z-score corresponding to the desired level of confidence (90% = 1.645), p is the estimated probability of flipping heads (which we assume to be 0.5 for a fair coin), and n is the sample size we need to determine.

We want the margin of error to be at most 0.16, so we can plug in these values and solve for n:

0.16 = 1.645*sqrt(0.5*(1-0.5)/n)

Squaring both sides and rearranging, we get:

n = (1.645/0.16)^2 * 0.5*(1-0.5)

n ≈ 84.18

So we would need to flip the coin at least 85 times to obtain a 90% confidence interval for the probability of flipping a head with a width of at most 0.16. Note that this assumes that the coin is actually fair – if it is biased towards heads or tails, we may need a larger sample size to achieve the same level of precision.

To find the required number of coin flips for a 90% confidence interval with a width of at most 0.16, we can use the formula for the margin of error in a proportion:

Margin of Error = Z * sqrt(p * (1-p) / n)

Here, Z is the Z-score corresponding to the desired confidence level (90%), p is the suspected probability of flipping a head (0.5, since we suspect the coin is fair), and n is the number of flips we want to find.

For a 90% confidence interval, the Z-score is approximately 1.645 (you can find this from a Z-table). The margin of error is half the width of the confidence interval, so in this case, it's 0.16 / 2 = 0.08.

Now, we can plug these values into the formula and solve for n:

0.08 = 1.645 * sqrt(0.5 * (1-0.5) / n)

Squaring both sides, we get:

0.0064 = 2.706025 * (0.5 * 0.5) / n

To isolate n, we can rearrange the equation:

n = 2.706025 * (0.5 * 0.5) / 0.0064

n ≈ 106.09

Since we cannot have a fraction of a coin flip, we round up to the nearest whole number. Thus, we would need to flip the coin 107 times to obtain a 90% confidence interval with a width of at most 0.16 for the probability of flipping a head.

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A random sample of the heights (in inches) of seventh grade boys was taken the five number summary for the sample is (59, 61, 64, 67, 72) then the IQR is 6.

The interquartile range (IQR) is the difference between the third quartile (Q3) and the first quartile (Q1).

To find Q1 and Q3, we need to use the five-number summary given in the problem:

Min = 59

Q1 = 61

Median = 64

Q3 = 67

Max = 72

Therefore, the IQR is:

IQR = Q3 - Q1

= 67 - 61

= 6

Hence, a random sample of the heights (in inches) of seventh grade boys was taken the five number summary for the sample is (59, 61, 64, 67, 72) then the IQR is 6.

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Answer:

314 sqft

Step-by-step explanation:

area = π r² =100π =314 sqft

The probability that kid 1 gets at least 3 chocolates is 4/9 or approximately 0.444.

There are a total of [tex]{8+3-1 \choose 3-1} = {10 \choose 2} = 45[/tex] possible ways to divide the chocolates among the 3 kids, using stars and bars method.

Let's calculate the number of ways that kid 1 can get at least 3 chocolates.

If kid 1 gets 3 chocolates, there are [tex]{5+2-1 \choose 2-1} = {6 \choose 1} = 6[/tex]

ways to divide the remaining 5 chocolates between the other 2 kids.

If kid 1 gets 4 chocolates, there are[tex]{4+2-1 \choose 2-1} = {5 \choose 1} = 5[/tex]

ways to divide the remaining 4 chocolates between the other 2 kids.

If kid 1 gets 5 chocolates, there are [tex]{3+2-1 \choose 2-1} = {4 \choose 1} = 4[/tex]

ways to divide the remaining 3 chocolates between the other 2 kids.

If kid 1 gets 6, 7, or 8 chocolates, there are 3, 1, and 1 ways to divide the remaining chocolates, respectively.

Therefore, the total number of ways that kid 1 gets at least 3 chocolates is 6 + 5 + 4 + 3 + 1 + 1 = 20.

The probability that kid 1 gets at least 3 chocolates is the ratio of the number of favorable outcomes (20) to the total number of possible outcomes (45), which is 20/45 = 4/9.

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An experimental design that administers one or more levels of one independent variable in combination with two or more levels of another independent variable is called a factorial design. In a factorial design, researchers can examine the effects of multiple independent variables on the dependent variable, as well as any interaction effects between the independent variables.

For example, a researcher may investigate the effects of two different types of therapy (independent variable 1) and the severity of a patient's depression (independent variable 2) on the patient's level of improvement (dependent variable). By varying the levels of both independent variables, the researcher can better understand how the two factors interact and influence the outcome.

In a factorial design, researchers manipulate one or more independent variables, each with multiple levels, to study the combined effects on a dependent variable. By examining the interaction between the independent variables, factorial designs provide valuable insights into complex relationships and help identify possible confounding factors. In summary, a factorial design combines various levels of independent variables to analyze their combined influence on the dependent variable in a systematic and efficient manner.

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To test for a statistically significant difference between the population means for first- and fourth-round scores, we can use a two-sample t-test with a significance level of .10.

Assuming that the sample data meets the necessary assumptions for a t-test (e.g. normality, equal variances), we can calculate the t-statistic using the following formula:

t = (x1 - x4) / (s√(1/n1 + 1/n4))

where x1 and x4 are the sample means for first- and fourth-round scores, s is the pooled standard deviation, n1 and n4 are the sample sizes for the two groups.

Once we have calculated the t-statistic, we can determine the corresponding p-value using a t-distribution table or calculator. The p-value represents the probability of obtaining a t-statistic as extreme or more extreme than the one observed, assuming the null hypothesis (i.e. no difference between the population means) is true.

If the p-value is less than .10, we can reject the null hypothesis and conclude that there is a statistically significant difference between the population means. On the other hand, if the p-value is greater than .10, we fail to reject the null hypothesis and conclude that there is not enough evidence to suggest a difference between the population means.

Therefore, to answer the question, we need to know the sample means, standard deviations, and sample sizes for the first- and fourth-round scores, and use them to calculate the t-statistic and p-value. Without this information, we cannot determine the exact value of the p-value.

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Since 72 beats per minute is within his THRZ, he is exercising at an appropriate intensity level.

What is THRZ?

THRZ stands for Target Heart Rate Zone. This is the range of heart beats per minute that is often used to determine exercise intensity during exercise. THRZ is usually calculated based on a person's age, resting heart rate, and maximum heart rate, and can vary based on a person's exercise goals and health status. Staying within the THRZ during exercise is thought to provide the most effective cardiovascular training and help maximize the benefits of exercise.

To calculate the lower end of his THRZ, we can multiply his MHR by 0.6:

190 x 0.6 114 bpm

To calculate the upper end of his THRZ, we can multiply his MHR by 0.8:

190 x 0.8152 bpm.

Therefore, Robert's THRZ ranges from 114 bpm to 152 bpm.

Since he counted 12 beats in 10 seconds, we can calculate his heart rate in beats per minute as follows:

12 beats / 10 seconds = x beats / 60 seconds x = 72 beats per minute

Since 72 beats per minute is within his THRZ, he trains at an appropriate intensity.

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The experimenter should take a sample of at least 68 copper cable segments to achieve a 99% confidence interval with a width of no more than 0.5.

Since a sample size must be a whole number, To construct a 99% confidence interval with a width of at most 0.5 for the average resistance of a copper cable segment, the experimenter needs to determine an appropriate sample size. To do this, they must consider the standard deviation (1.55) and the desired level of confidence.

For a 99% confidence interval, the z-score is approximately 2.576. The formula for calculating the required sample size (n) is:

n = (z * σ / E)²

where z is the z-score, σ is the standard deviation, and E is the desired margin of error (half of the confidence interval width, or 0.25 in this case).

n = (2.576 * 1.55 / 0.25)²

n ≈ 67.49

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The level curves of F(x,y) = C give the implicit general solutions to the differential equation.To find My and Nx, we need to rearrange the differential equation in the form of Mdx + Ndy = 0, where M and N are functions of x and y.

Starting with the given differential equation:

mdx + ndy = 0

We can plug in the values of m and n from the equation given:

(4x + 5y)dx + (5x + 5y)dy = 0

Now we can identify M and N:

M = 4x + 5y

N = 5x + 5y

Therefore:

My = dN/dy = 5

Nx = dM/dx = 4

Since My is not equal to Nx, the equation is not exact. To find the function F(x,y), we can use an integrating factor.

First, we find the integrating factor, u:

u(x) = e^(∫(My - Nx)/Nx dy) = e^(∫(5-4)/4 dy) = e^(y/4)

Multiplying both sides of the differential equation by u(x):

e^(y/4)(4x + 5y)dx + e^(y/4)(5x + 5y)dy = 0

We can rewrite this as:

d(e^(y/4)(4x + 5y)) = 0

Integrating both sides with respect to x:

e^(y/4)(4x + 5y) = F(y)

Therefore:

F(x,y) = e^(y/4)(4x + 5y)

Therefore, The level curves of F(x,y) = C give the implicit general solutions to the differential equation.

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The life expectancy will reach 75 years old in the year 1970.

We have,

Let's start by defining the variables:

L = life expectancy in years

t = time in years since 1900

We know that from 1900 to 1960, life expectancy increased at a constant rate of 0.401 years per year.

So, we can write the following equation to represent the relationship between L and t:

L = 0.401t + b

where b is the life expectancy in 1900.

To find b, we can use the fact that the life expectancy in 1900 was around 47 years old.

b = 47

So, the equation becomes:

L = 0.401t + 47

We also know that in 1942, the life expectancy was 62.9 years old.

So, we can use this information to find the value of t in 1942:

62.9 = 0.401t + 47

Solving for t, we get:

t = (62.9 - 47) / 0.401 = 39.15

In 1942,

t = 39.15.

To find the year when the life expectancy reaches 75 years old, we can plug in L = 75 into the equation and solve for t:

75 = 0.401t + 47

Solving for t.

t = (75 - 47) / 0.401 = 69.82

So, the life expectancy will reach 75 years old in the year:

1900 + 69.82 = 1969.82

Therefore,

The life expectancy will reach 75 years old in the year 1970.

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The approximate probability of getting a z-score between +1 standard deviation and +2.5 standard deviations in a standard normal distribution is 0.1525.

To find the area under the standard normal curve between +1 standard deviation and +2.5 standard deviations, we can use a standard normal distribution table or calculator. Here are the steps:

Therefore, the area under the standard normal curve between +1 standard deviation and +2.5 standard deviations is approximately 0.1525.

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The expression (x⁵ / x¹⁰) ÷ x² in the simplified form will be 1/x⁷.

Given that:

Expression, (x⁵ / x¹⁰) ÷ x²

The definition of simplicity is making something simpler to achieve or grasp while also making it a little less complicated.

Simplify the expression, then we have

⇒ (x⁵ / x¹⁰) ÷ x²

⇒ (1 / x⁵) ÷ x²

⇒ 1 / (x⁵ · x²)

⇒ 1 / x⁷

The expression (x⁵ / x¹⁰) ÷ x² in the simplified form will be 1/x⁷.

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The correct answer is d. 56.

When computing a correlation coefficient, the degrees of freedom (df) is calculated as (n-2), where n is the sample size. In this case, we are given that df = 55.

Substituting df = 55 into the formula, we get:

55 = n - 2

Adding 2 to both sides, we get:

n = 57

Therefore, the sample size must be 57 in order to have 55 degrees of freedom when computing a correlation coefficient.
Hi! When computing a correlation coefficient with 55 degrees of freedom, your sample size must be 57 (Option c).

Here's the step-by-step explanation:
1. Recall that the formula to find degrees of freedom (df) in correlation is df = n - 2, where n is the sample size.
2. In this case, the degrees of freedom is given as 55.
3. To find the sample size (n), you'll need to rearrange the formula: n = df + 2.
4. Substitute the given degrees of freedom into the formula: n = 55 + 2.
5. Solve for n: n = 57.

Therefore, when computing a correlation coefficient with 55 degrees of freedom, your sample size must be 57.

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Thus, total, we have 6 + 4 + 2 = 12 four-digit integers that  that are not multiples of 1111 do the digits form an arithmetic sequence.

Let's first understand the criteria for the four-digit integers:

1. They are not multiples of 1111.
2. Their digits form an arithmetic sequence.

Now, let's analyze the four-digit integers. We can represent them as ABCD, where A, B, C, and D are the individual digits. Since the digits form an arithmetic sequence, we can represent this sequence as A, A+d, A+2d, and A+3d. Here, "A" is the first digit, "d" is the common difference, and A ≠ 0.

Since A+3d is the last digit, it must be less than 10. So, A+3d < 10. Given that A ≥ 1, we can deduce that d can take the values 1, 2, or 3.

Now let's consider each value of "d":

1. If d = 1, A can range from 1 to 6. This results in 6 possible four-digit integers.
2. If d = 2, A can range from 1 to 4. This results in 4 possible four-digit integers.
3. If d = 3, A can range from 1 to 2. This results in 2 possible four-digit integers.

In total, we have 6 + 4 + 2 = 12 four-digit integers that meet the given criteria.

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Cystic fibrosis is an autosomal recessive genetic disorder. This means that in order for a child to have cystic fibrosis, both parents must be carriers of the recessive gene.

When both parents are carriers, the probability for each child to inherit the disorder is as follows:

1. 25% chance of having cystic fibrosis (inheriting two copies of the recessive gene)
2. 50% chance of being a carrier (inheriting one copy of the recessive gene)
3. 25% chance of not being a carrier or having the disorder (inheriting no copies of the recessive gene)

Since the question states that the first two children do not have cystic fibrosis, this does not affect the probability of the third child having cystic fibrosis. The probability remains the same for each pregnancy.

Therefore, the probability of the third child having cystic fibrosis is still 25%. It's important to note that the probabilities are independent for each child, meaning the outcome of one child's genetic inheritance does not influence the outcome for another child.

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A chi-square test of independence is indeed a one-tailed test. The reason for this is that we are testing whether the observed frequencies of two categorical variables are significantly different from the expected frequencies.

We square the deviations between the observed and expected frequencies, and since deviations can only be positive, the test statistic always lies at or above zero. Hypothesis tests are one-tailed when dealing with sample data because we have a specific direction for our research question. In the case of a chi-square test of independence, we are interested in whether one variable is dependent on the other variable, so we have a directional hypothesis. Furthermore, the chi-square distribution is positively skewed, meaning that the majority of the distribution is on the right-hand side. This is important to consider when interpreting the results of a chi-square test.

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In coordinate form, the system of equations has a solution of x = 4, y = 14, or (4, 14).

To solve the system of equations:

-3x + 2y = 16

5x - 4y = -36

We can use the method of elimination, which involves adding or subtracting the equations in order to eliminate one of the variables.

First, we can multiply the first equation by 5 and the second equation by 3, in order to make the coefficients of x opposite in sign:

-15x + 10y = 80

15x - 12y = -108

Now we can add the two equations to eliminate x:

-15x + 15x + 10y - 12y = 80 - 108

-2y = -28

y = 14

Substituting y = 14 into the first equation, we get:

-3x + 2(14) = 16

-3x + 28 = 16

-3x = -12

x = 4

Therefore, the solution to the system of equations is x = 4, y = 14, or (4, 14) in coordinate form.

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The appropriate null hypothesis would be that the market share percentage is equal to or less than 20 percent. This would be denoted as H0: p ≤ 0.20.

To know the appropriate null hypothesis for a company testing if the market share of a new product during its first year is more than 20 percent, the null hypothesis (H0) would be that the market share percentage is less than or equal to 20 percent. In other words:
H0: Market Share Percentage ≤ 20%

This null hypothesis is set up to test against the alternative hypothesis (H1) that the market share percentage is more than 20 percent:
H1: Market Share Percentage > 20%

The company would then collect data and perform a hypothesis test to determine if there is sufficient evidence to reject the null hypothesis in favor of the alternative hypothesis.

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Thus, there is a very high probability (99.93%) that the sample mean would differ from the true mean by less than 3.273 liters, given a sample size of 109 people and a population mean of 152 liters with a variance of 484.

To answer this question, we need to use the Central Limit Theorem, which states that the sampling distribution of the sample means will be approximately normal, regardless of the distribution of the population, as long as the sample size is large enough.

First, we need to calculate the standard error of the mean, which is the standard deviation of the sampling distribution of the sample means. We can use the formula:

standard error of the mean = standard deviation / square root of sample size

Plugging in the values given, we get:

standard error of the mean = √484 / √109
standard error of the mean = 2 / 109
standard error of the mean = 0.018

Next, we need to calculate the z-score, which tells us how many standard errors the sample mean is from the true mean. We can use the formula:

z-score = (sample mean - true mean) / standard error of the mean

Plugging in the values given, we get:

z-score = (sample mean - true mean) / 0.018
3.273 = (sample mean - 152) / 0.018
(sample mean - 152) = 0.018 * 3.273
sample mean = 152 + 0.059
sample mean = 152.059

So the sample mean is 152.059 liters.

Now we can use the standard normal distribution table to find the probability that the z-score is less than 3.273. Looking up the value in the table, we get:

P(z < 3.273) = 0.9993

Therefore, the probability that the sample mean would differ from the true mean by less than 3.273 liters is approximately 0.9993, or 99.93%.

In conclusion, there is a very high probability (99.93%) that the sample mean would differ from the true mean by less than 3.273 liters, given a sample size of 109 people and a population mean of 152 liters with a variance of 484. This probability is based on the Central Limit Theorem and the standard normal distribution table.

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The GCD of 25.73 and 54.132 is 3.137, which can be written as option a, 2.5.7.13.

In mathematics, the greatest common divisor (GCD) of two or more integers, which are not all zero, is the largest positive integer that divides each of the integers.

For two integers x, y, the greatest common divisor of x and y is denoted .The greatest common divisor (GCD) of 25.73 and 54.132 can be found by using prime factorization.

25.73 can be written as 5^2.73 and 54.132 can be written as 2^2.3.11.137.
To find the GCD, we need to find the common prime factors of both numbers, which are only 3 and 137.

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The number of blue sweets in the bowl are B = 108 sweets

Given data ,

The total number of sweets in the bowl = 675 sweets

Now , ratio of red to blue sweets is 3:7

And , ratio of blue to green sweets is 4:5

So , the ratio of red : blue : green is = 12 : 28 : 35

R      B     G

3       7

        4      5

12      28      35

On simplifying the proportion , we get

75x = 675

Divide by 75 on both sides , we get

x = 9

So , the number of blue sweets is 12x = 12 x 9

B = 108 sweets

Hence , the number of blue sweets is 108

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