please help!! its for homework that is due very soon!!

The MLE of σ^2 for a random sample X1, X2, ..., Xn from a normal distribution with known mean μ is s^2/(n-1), and the MLE of σ is the square root of s^2.

Given a random sample X1, X2, ..., Xn from a normal distribution with mean μ and unknown variance σ^2, the likelihood function is:

L(σ^2) = (1/(2πσ^2)^(n/2)) * exp[-(1/(2σ^2)) * ∑(Xi - μ)^2]

To find the maximum likelihood estimator (MLE) of σ^2, we need to find the value of σ^2 that maximizes the likelihood function.

To do this, we take the natural logarithm of the likelihood function, since the logarithm is a monotonically increasing function and thus does not change the location of the maximum:

ln L(σ^2) = (-n/2) ln(2πσ^2) - (1/(2σ^2)) * ∑(Xi - μ)^2

To maximize this expression, we take the derivative with respect to σ^2 and set it equal to zero:

d/d(σ^2) ln L(σ^2) = (-n/2σ^2) + (1/(2(σ^2)^2)) * ∑(Xi - μ)^2 = 0

Solving for σ^2, we get:

σ^2 = (∑(Xi - μ)^2) / n

This means that the MLE of σ^2 is the sample variance, s^2 = (∑(Xi - μ)^2) / (n-1), since we usually use the sample variance to estimate the population variance when the population mean is known.

Therefore, the MLE of σ is the square root of the sample variance:

σ(hat) = sqrt(s^2)

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____the given question is incomplete, the complete question is given below:

Suppose that X1, . . . , Xn form a random sample from a Normal distribution for which mean μ is known, but the variance σ

2

is unknown. Find the MLE (maximum likelihood estimation) of σ.

The statements that are true would be :

f(x) = 2√x has the same domain and range as f(x) = √x:

Both functions have a square root, so the domain must be x ≥ 0 in both cases. Since f(x) = 2√x is a vertical stretch of f(x) = √x by a factor of 2, the range of both functions starts at 0 and goes to positive infinity.

f(x) = -√x has the same domain as f(x) = √x but a different range:

In this relation, both functions have a square root, so the domain must be x ≥ 0 in both cases as it was in the first option. f(x) = -√x is a reflection of f(x) = √x over the x-axis, so the range is y ≤ 0, which is different from the range of f(x) = √x (y ≥ 0).

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In response to the stated question, we may respond that As a result, the expressions laboratory should be closed for 5.19 days to allow the radon gas to decline to a safe level.

An expression in mathematics is a combination of numbers, elements, and mathematical (like addition, reduction, multiplication, division, algebraic, and so on) that expresses an amount or value. Expressions may well be simple, such as [tex]"3 + 4"[/tex], or complicated, such as [tex]"(3x2 - 2) / (x + 1)"[/tex]. They might additionally contain functions like "sin(x)" or "log(y)". Expressions can be assessed by substituting variables with their values and performing the arithmetic operations in the specified sequence. For example, if x = 2, the ratio [tex]"3x + 5" equals 3(2) + 5 = 11.[/tex]Expressions are commonly used in mathematics to describe real-world situations, generate equations, and simplify complicated mathematical concerns.

We must apply the notion of radioactive decay and the half-life of radon gas to address this dilemma.

Begin by calculating the percentage of the safe radiation level that corresponds to the 40% increase. This can be written as:

[tex]1 + 0.4 = 1.4[/tex]

As a result, the resultant radiation level is 1.4 times that of the safe threshold.

To compute the proportion of the original amount of radon gas that remains after a certain period t, we may use the following formula:

[tex]N/NO = (1/2) t/T1/2)1/2 t/3.8) = 1/1.42 t/3.8) 1.4t / 3.8 = log(2) * (1.4)(1.4)t = 3.8x * log(2) * (1.4)t = 5.19[/tex]

As a result, the laboratory should be closed for 5.19 days to allow the radon gas to decline to a safe level.

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Answer:

Step-by-step explanation:

Let's assume that 'a' adults and 'c' children attended the concert.

From the problem statement, we know that:

a + c = 107 ---(1) (The total number of people who attended the concert is 107)

3.75a + 3.5c = 391.25 ---(2) (The total revenue generated from the concert is $391.25)

Now, we need to solve these two simultaneous equations to find the values of 'a' and 'c'.

To do this, we can use the elimination method to solve these equations.

First, we will multiply equation (1) by 3.5 to eliminate 'c':

3.5a + 3.5c = 374.5 ---(3)

Next, we will subtract equation (3) from equation (2):

3.75a + 3.5c - (3.5a + 3.5c) = 391.25 - 374.5

0.25a = 16.75

a = 67

Now that we know the value of 'a', we can substitute it into either equation (1) or (2) to find the value of 'c':

a + c = 107

67 + c = 107

c = 40

Therefore, there were 67 adults and 40 children at the concert.

Answer:

[tex]96 \: {m}^{2} [/tex]

The correct answer is B

Step-by-step explanation:

First, we have to find the area of one side of the cube:

[tex]a(side) = 4 \times 4 = 16[/tex]

Now multiply this number by 6 (since the cube has 6 sides in total):

[tex]a(surface) = 16 \times 6 = 96[/tex]

Answer: B - 96 sq m

Step-by-step explanation:

The surface area is the area of all the squares added up. To find the area of one square, you multiply 4 x 4, which equals 16. Then, count the number of sides on the cube. There are 6 sides on this cube. So, you multiply        16 x 6. 96 is your total. And you can eliminate C because it says meters instead of square meters.

The probability that at least 10 students in a random sample of 20 are Business majors is 0.139. The probability that at least 16 students in the sample are not Business majors is 0.147.

a. To find the probability that at least 10 students in a random sample of 20 are Business majors, we can use the binomial distribution with parameters n = 20 and p = 0.3 (the probability of success, i.e. being a Business major). Using a calculator or software, we can find this probability as:

P(X >= 10) = 1 - P(X < 10) = 1 - binomcdf(20, 0.3, 9) = 0.139

b. To find the probability that at least 16 students in the sample are not Business majors, we can use the same approach, but with q = 0.7 (the probability of failure, i.e. not being a Business major):

P(X >= 16) = 1 - P(X < 16) = 1 - binomcdf(20, 0.7, 15) = 0.147

c. To find the probability that exactly 10 students in the sample are Business majors, we can use the binomial probability formula:

P(X = 10) = (20 choose 10) * (0.3)^10 * (0.7)^10 = 0.201

d. To find the probability that exactly 12 students in the sample are not Business majors, we can use a similar formula:

P(X = 12) = (20 choose 12) * (0.7)^12 * (0.3)^8 = 0.200

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Answer:

B

Step-by-step explanation:

The pattern is white black white. This eliminates options A and D

We then look at the patterns of the shapes. We can eliminate option F from this. Now, all we have left are options B and E. We see that the middle shape pattern is 3 of each. So, we have 3 stars, 3 diamonds, and 3 squares.  This leaves the only option of B left.

In a diagram,

Then,

[tex]\dfrac{DE}{BC}=n[/tex]

For example, suppose that n=2; thus,

[tex]DE=2BC\longrightarrow2\times CA[/tex]

We can form a new triangle DEF whose side EF is parallel to CA; therefore,

[tex]\longrightarrow EF=2CA[/tex]

Answer:

The maximum number of students to whom 48 apples, 60 bananas, and 96 guavas can be distributed equally is 20. Each student will receive 2 apples, 3 bananas, and 4 guavas.

From the table, the calculated equation of h(x) in vertex form is h(x) = (x + 1)² + 2

To find the equation of the quadratic function h(x) in vertex form, we need to first determine the coordinates of the vertex.

The vertex form of a quadratic function is given by

y = a(x - h)² + k, where (h, k) is the vertex of the parabola.

From the table, we have

(h, k) = (-1, 2)

So, we have

y = a(x + 1)² + 2

To determine the value of 'a', we can substitute any other point from the table into the vertex form equation and solve for 'a'.

For example, using the point (0, 3), we have:

a(0 + 1)² + 2 = 3

a = 1

So, we have

y = (x + 1)² + 2 as the equation

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Answer:

x = 2

y = -3/4

Step-by-step explanation:

1. Substitute y=1/8x -1 in −5x+4y=−13

-5x+4(1/8x -1) = -13

2. Solve for x

-5x + 4/8x - 4 = -13

-9/2x - 4 = -13

-9/2x = -9

x = 2

3. Now that you know x = 2, plug it into y=1/8x - 1 to find what y is.

y= 1/8(2) - 1

y= 2/8 - 1

y= -3/4

The surface area is  1305. 96 square units

It is important to note that the formula for calculating the surface area of a cylinder is expressed with the equation;

SA = 2πrh + 2πr²

Given that the parameters are;

Now, substitute the values, we have;

Surface area = 2 × 3.14 × 9 ×14 + 2 × 3.14 × 9²

Multiply the values

Surface area = 791. 28 + 508. 68

add the values

Surface area = 1305. 96 square units

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If you need 1 1/4 cups of sugar to make cookies, that is the amount of sugar needed for one batch of cookies. To find out how much sugar is needed to make 16 cookies, we can set up a proportion:

1 1/4 cups sugar is needed to make 1 batch of cookies

x cups sugar is needed to make 16 cookies

We can solve for x by cross-multiplying:

1 1/4 * 16 = x

20/4 = x

5 = x

Therefore, you will need 5 cups of sugar to make 16 cookies.

The value for mean, variance, and standard deviation for the given set of data is 63.22, 794.04, and 28.17, respectively.

The method to calculate the various operations are:

Mean:

= (79 + 52 + 64 + 99 + 75 + 48 + 52 + 24 + 76) / 9 = 63.22

Mean is a measure of central tendency found by adding all the observations and dividing the result by the number of frequency or the total number of data set values.

Variance:

= ((79 - 63.22)² + (52 - 63.22)² + (64 - 63.22)² + (99 - 63.22)² + (75 - 63.22)² + (48 - 63.22)² + (52 - 63.22)² + (24 - 63.22)² + (76 - 63.22)² / (9-1) = 794.04

(Here, 63.22 is the mean calculated earlier)

Standard deviation:

= √(Variance)

=√(794.04) = 28.17

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Complete question is:

For each of the given sample data sets below, calculate the mean, variance, and standard deviation. (a) 79, 52, 64, 99, 75, 48, 52, 24, 76 mean =_______

variance = __________

standard deviation =_________

The solution to the compound inequality -3+b> 7 OR b +9 <17 is given as follows:

b < 8 or b > 10.

The inequality for this problem is defined as follows:

-3+b> 7 OR b +9 <17.

The or operation means that the we must solve each operation separately, and then the solution set to the compound inequality is given by the union of the solution set of each of the inequalities.

The solution set for the first inequality is given as follows:

-3+b> 7

b > 10.

The solution set for the second inequality is given as follows:

b + 9 < 17

b < 8.

Hence the solution for the entire inequality is of:

b < 8 or b > 10.

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The mathematical model that represents the general price movement of mortgages is:     ΔPM = f(Δk, ΔPrin, ΔC)

Where ΔPM is the change in the price of the mortgage, Δk is the change in the required rate of return, ΔPrin is the change in the principal payment, and ΔC is the change in the interest payment.

This means that the change in the price of a mortgage is a function of the change in the required rate of return, the change in the principal payment, and the change in the interest payment.

The securities that are issued to financial institutions to increase liquidity in the secondary mortgage market by financing the origination of mortgages are:

Financial institutions may also receive private-label pass-through securities, although these are not guaranteed by government entities like Ginnie Mae, Freddie Mac, or Fannie Mae.

They are not backed by the government, but by private institutions, which can make them riskier.

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Answer:

.224 or 224/1000 or 28/125

Step-by-step explanation:

The probability of a person chosen at random having run a red light in the last year is:

P(run a red light) = Number of people who said "yes" / Total number of people surveyed

P(run a red light) = 131 / (131 + 452)

P(run a red light) ≈ 0.224 (rounded to 3 decimal places)

So the probability is approximately 0.224 or 224/1000 or 28/125.

Answer:

131/583

Step-by-step explanation:

Probability is the measure of likelihood or chance that an event will occur.

[tex]\text{Probability} = \frac{\text{Possible outcome of event}}{\text{Total outcome}}[/tex]

Total number of people asked if they had run a red light = number of people that responded 'yes' + number of people that responded 'no'

[tex]\text{Total outcome} = 131+452[/tex]

[tex]\text{Total outcome} = 583[/tex]

[tex]\text{Possible outcome} = \ \text{number of people that responded yes} = 131[/tex]

Probability that if a person is chosen at chosen at random, they have run a red light in the last year will be 131/583.

Answer:

A

Step-by-step explanation:

∠ o and ∠ z are alternate exterior angles and are congruent, that is

∠ z = ∠ o = 125°

a. it will take 8 days for the population to quadruple in size.

b. t will take 6.34 days for the population to triple in size.

Organisms οf a species living tοgether in a grοup at a particular place are called a “pοpulatiοn” in Biοlοgy. A pοpulatiοn is an assοrtment οf οrganisms in a given lοcatiοn. These οrganisms, since they belοng tο the same species, can interbreed and prοduce mοre οf their kinds.

We have to use the following formula

P(t) = P0(b)t

⇒ 6000000 = 3000000(b)4

⇒ b4 = 2

⇒ b = 21/4

a.  12000000 = 3000000(2)t/4

⇒ 4 = 2t/4

⇒ 22 = 2t/4

⇒ 2 = t/4

⇒ t = 8 days

Thus, it will take 8 days for the population to quadruple in size.

b. 9000000=3000000(2)t/4

⇒ 3 = 2t/4

⇒ log 3 = (t/4)log 2

⇒ t = 6.34 days

Thus, it will take 6.34 days for the population to triple in size.

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The middle 50% data of the boxplot will be calculated between the value of 7 to 14.

The data set ranges are:

4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17

Divide the given data in 4 quartiles Qs;

Q1 = 4 - 6

Q2 = 7 - 10

Q3 = 11 - 14

Q4 = 15 - 17

Thus, 50% data will be lying in Q2 and Q3.

Range - 7 - 14

Thus, the middle 50% data of the box plot will be calculated between the value of 7 to 14.

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Answer:

A) the sides all have the same slopes.

Step-by-step explanation:

Every time a square in a graph is a square, their slopes MUST be the same, either that or nothing, it can't be a square.

So, the most precise classification of quadrilateral LMNP is a kite.

In mathematics, an equation is a statement that two mathematical expressions are equal. It typically contains variables, constants, and mathematical operations such as addition, subtraction, multiplication, and division. The goal of solving an equation is to find the values of the variables that make the equation true. Equations are used in many areas of mathematics, science, and engineering to model relationships between quantities and to solve problems.

Here,

To classify the quadrilateral LMNP, we need to calculate the length of all four sides using the distance formula and then use those values to determine the shape of the quadrilateral.

The distance formula is given by:

d = √[(x₂ - x₁)² + (y₂ - y₁)²]

Using this formula, we can calculate the length of each side of the quadrilateral as follows:

LM = √[(4 - (-1))² + (9 - 7)²] = √[5² + 2²] = √29

MN = √[(8 - 4)² + (-1 - 9)²] = √[4² + (-10)²] = √116

NP = √[(3 - 8)² + (-3 - (-1))²] = √[(-5)² + (-2)²] = √29

PL = √[(-1 - 3)² + (7 - (-3))²] = √[(-4)² + 10²] = √116

Now, we can use the values we have calculated to determine the shape of the quadrilateral. We can see that LM = NP and MN = PL, which means that opposite sides are congruent. Also, LM and MN are not equal to PL and NP, which means that opposite sides are not parallel. Therefore, LMNP is a kite.

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None of these courses were being taken by seniors is 9.

A Venn diagram is a type of graphic representation that uses circles to emphasise the relationships between certain items or constrained groups of things. Circles with overlaps exhibit certain traits, but circles without overlaps do not.

Total number of students=150

Number of students Math =80

Number of students Spanish =41

Number of students Physics=54

Number of students Math and Spanish=10

Number of students Math and Physics=19

Number of students Physics and Spanish=12

Number of students Physics and Spanish and math=7

seniors were taking none of these courses =150-(80+41+54)+10+19+12-7

=9

Diagram is attached below:

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The magnitude and direction of the resultant vector are 50.479 and 73 degrees, respectively.

What is vector addition?

Vector addition is the operation of adding two or more vectors together into a vector sum. The so-called parallelogram law gives the rule for the vector addition of two or more vectors. For two vectors, the vector sum is obtained by placing them head to tail and drawing the vector from the free tail to the free head.

To find the magnitude and direction of the resultant vector, we need to add the two given vectors. We can do this using vector addition, where we add the corresponding components of each vector.

First, let's convert the given magnitudes and directions into component form. We can use the following equations to find the x and y components of each vector:

Magnitude = √(x² + y²)

Direction = tan⁻¹(y/x)

For the first vector with magnitude 28 and direction 500, we have:

Magnitude = 28

Direction = 500 degrees

x = Magnitude * cos(Direction) = 28 * cos(500) = -14

y = Magnitude * sin(Direction) = 28 * sin(500) = -24.202

Therefore, the first vector can be written as v1 = <-14, -24.202>

Similarly, for the second vector with magnitude 75 and direction 1250, we have:

Magnitude = 75

Direction = 1250 degrees

x = Magnitude * cos(Direction) = 75 * cos(1250) = 28.481

y = Magnitude * sin(Direction) = 75 * sin(1250) = 72.929

Therefore, the second vector can be written as v2 = <28.481, 72.929>

To find the resultant vector, we can add the components of the two vectors:

v = v1 + v2 = <-14, -24.202> + <28.481, 72.929> = <14.481, 48.727>

The magnitude of the resultant vector is:

Magnitude = √(x² + y²) = √(14.481² + 48.727²) = 50.479

Rounding to the thousandth place, the magnitude of the resultant vector is 50.479.

The direction of the resultant vector can be found using the following equation:

Direction = tan⁻¹(y/x) = tan⁻¹(48.727/14.481) = 72.636 degrees

Rounding to the nearest degree, the direction of the resultant vector is 73 degrees.

Therefore, the magnitude and direction of the resultant vector are 50.479 and 73 degrees, respectively.

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[tex](\stackrel{x_1}{-3}~,~\stackrel{y_1}{3})\qquad (\stackrel{x_2}{7}~,~\stackrel{y_2}{q}) \\\\\\ \stackrel{slope}{m}\implies \cfrac{\stackrel{\textit{\large rise}} {\stackrel{y_2}{q}-\stackrel{y1}{3}}}{\underset{\textit{\large run}} {\underset{x_2}{7}-\underset{x_1}{(-3)}}} ~~ = ~~\stackrel{\stackrel{\textit{\small slope}}{\downarrow }}{ \cfrac{ -7 }{ 10 }}\implies \cfrac{q-3}{7+3}=\cfrac{ -7 }{ 10 }\implies \cfrac{q-3}{10}=\cfrac{ -7 }{ 10 } \\\\\\ q-3=-7\implies q=-4[/tex]

Answer:

To find the total surface area of a pyramid you do SURFACE AREA =B+12(P×l)

Answer:

50

Step-by-step explanation:

A Venn diagram is very helpful for this picture and I've included one in the attached.

If we look at the numbers we're given, we see that the numbers do not add up to 500 as 350 + 300 + 200 = 850.

However, we can work through the numbers to find the exact values and eventually the number of people that liked neither rock nor country.

Since 200 people like both rock and country, these people are part of the 350 people that like rock.

We can find the number of people who like rock only by subtracting 200 from 350:

350 - 200 = 150 (Rock only)

Using the same logic from above, we know that the 200 people who like both rock and country are a part of the 300 people who like country.

We can find the number of people who like country only by subtracting 200 from 300:

300 - 200 = 100 (Country only)

Currently, we have 450/500 as 150 + 200 + 100 = 450.

Now, we can find the number of people who like neither rock nor country by subtracting 450 from 500:

500 - 450 = 50 (Neither rock nor country)

We can check that the numbers we found equal 500:

Rock only + Both rock and country + Country only + Neither rock nor country = Total amount of music lovers surveyed

150 + 200 + 100 + 50 = 500

500 = 500

(**In the attached Venn diagram, M stands for the total set of music lovers, R stands for rock only, B stands for both, C stands for country only, and N stands for neither)

The specific heat of water is [tex]+41840J . mol^{-1}[/tex].

The following formula is used to determine how much heat a substance absorbs or releases during a heat exchange between two bodies, Calculate the value of q.

Q = m.s.t

Where,

Q is equal to how much heat is received or emitted.

m = The substance's mass

t = Temperature change

s = The substance's specific heat

The starting temperature in this dissolve is,

[tex]T_{i}[/tex] = 25.00°C

(25.00 + 273.00) K

= 298.00 K

Final temperature in this dissolving is,

[tex]T_{f}[/tex] = 23.36°C

= (23.36 + 273.00) K

Specific Water's heat is, [tex]4.184\frac{J}{g.K}[/tex]

In this issue, the heat that water releases are,

[tex]Q_{released} = 50.0g*4.184\frac{J}{g.K} * (298.00 - 296.36)K[/tex]

= 343.088J

2) Molar Mass of KClO₃ is [tex]122.55g mol^{-1}[/tex]

As a result, number of moles of KClO₃ present in 1g sample is,

[tex]\frac{1.00g}{122,55g/mol} = 0.0082mols[/tex]

Hence, the standard enthalpy change of the dissolving process is determined as follows:

Δ[tex]H^{o} = +\frac{343.088J}{0.0082mol} \\= +41840J . mol^{-1}[/tex]

The plus symbol (+) denotes the absorption of heat during the dissolving phase.

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Complete Question:

When 1.00 g potassium chlorate (KCIO₃) is dissolved in 50.0 g water in a Styrofoam calorimeter of negligible heat capacity, the temperature decreases from 25.00°C to 23.36°C. Calculate q for the water and AH° for the process. KCIO: (s) → K* (aq) + CIO (aq) The specific heat of water is 4.184 J K-1 g¯!.

If "f" is differentiable and f(1) < f(2), then there is a number "c", in the interval  (1, 2)  such that f'(c)>  0.

Applying the  Mean Value Theorem for derivatives, if a function f is continuous on the closed interval [a, b] and differentiable on the open interval (a, b), then there exists at least one number c in the interval (a, b) such that:

f'(c) = (f(b) - f(a)) / (b - a)

In the scenario above, we have that f is differentiable, and that f(1) < f(2).

choosing a = 1 and b = 2.

Then applying the Mean Value Theorem, there exists at least one number c in the interval (1, 2) such that:

f'(c) = (f(2) - f(1)) / (2 - 1)

f'(c) = f(2) - f(1)

We have that f(1) < f(2), we have:

f(2) - f(1) > 0

We can conclude by saying that there exists a number c in the interval (1, 2) such that:

f'(c) = f(2) - f(1) > 0

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