Solve by graphing

4x - 4y = 22
y = -5.5

The variance of a random variable is a measure of its spread and is the variance of X is 25.

The variance of a random variable is a measure of its spread and is calculated as the average of the squares of the differences between each value and the mean. Mathematically, the variance of a random variable X is denoted as Var(X) and is computed as follows: Var(X) = E[X^2] - (E[X])^2, where E[X] is the expected value of X.

To illustrate, let X be a random variable with the following values: {2, 4, 6, 8}. The expected value of X is 5 (E[X] = (2+4+6+8)/4). Therefore, the variance of X can be computed as follows:

Var(X) = E[X^2] - (E[X])^2

= (2^2 + 4^2 + 6^2 + 8^2)/4 - (5)^2

= 50 - 25

= 25

Hence, the variance of X is 25.

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The required volume of the solid which was obtained by rotating the region bounded by the curve about a line is equal to  ( π/2 ) (  e⁻⁴  + e⁴).

Graph is attached.

Volume of the solid rotating the region bounded by the curves about a line with y = eˣ with x = −2, x = 2 about x-axis.

=π [tex]\int_{-2}^{2}[/tex] [( eˣ - 0)² ] dx

= π [tex]\int_{-2}^{2}[/tex] e⁽²ˣ⁾ dx

= π (e²ˣ) / ( 2 [tex]|_{-2}^{2}[/tex]

= ( π/2 )[  e⁻⁴  - e⁴  ]

= ( π/2 ) (  e⁻⁴  +  e⁴ )

Graph is attached.

Therefore, the volume of the solid of the rotating region bounded by curves about line is equal to  ( π/2 ) (  e⁻⁴  +  e⁴ ).

Graph is attached.

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The required money that Taha paid more than lowan is £0.6, as per the given condition.

In mathematics, it deals with numbers of operations according to the statements. There are four major arithmetic operators, addition, subtraction, multiplication, and division,

Here,
Taha buys one fish, a portion of peas, and pickled onion.
taha paid = 2.70 + 0.45 + 0.25
= £3.40

Lowan buys a portion of rice, a sausage, and a bread roll.

Total money lowan to pay
= 0.90 + 1.60 + 0.30
= £2.80

Money Taha pays more than lowan = 3.40 - 2.80
                                                      = £0.6

Thus, the required, money that Taha paid more than lowan is £0.6, as per the given condition.

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The required expression are A = l * h = 2 * h * [tex]\sqrt(r^2 - h^2)[/tex] , 2 * (2 * [tex]\sqrt(r^2 - h^2)[/tex] + h).

A rectangle inscribed in a semicircle of radius r cm will have its sides parallel to the diameter of the semicircle, with one side coinciding with the diameter and the other side forming a chord of the circle.

Let the length of the rectangle be l cm. Then, the height of the rectangle h and the radius of the semicircle r form a right triangle with hypotenuse r and legs h and l/2. By the Pythagorean theorem, we have:

r^2 = h^2 + (l/2)^2

Expanding and solving for l, we have:

l = 2 √(r^2 - h^2)

The area A of the rectangle can be found by multiplying the length and height:

A = l * h = 2 * h * [tex]\sqrt(r^2 - h^2)[/tex]

The perimeter P of the rectangle can be found by adding up the lengths of the four sides:

P = 2l + 2h = 2 * (2 * [tex]\sqrt(r^2 - h^2)[/tex] + h)

To find the dimensions that yield the maximum area, we can differentiate the expression for A with respect to h and set the derivative equal to zero:

dA/dh = 2 * [tex]\sqrt(r^2 - h^2)[/tex] - 2 * h^2 / [tex]\sqrt(r^2 - h^2)[/tex]= 0

Solving for h, we have:

h = r / [tex]\sqrt(2)[/tex]

Substituting this value of h back into the expression for l, we have:

l = 2 * [tex]\sqrt(r^2 - (r / \sqrt(2))^2) = 2 * r / \sqrt(2)[/tex]

So the dimensions that yield the maximum area are a length of 2r/sqrt(2) cm and a height of r/sqrt(2) cm. The maximum area is given by:

A = 2 * (r / [tex]\sqrt(2)) * r / \sqrt(2)[/tex] =r²/√2.

A = r²/√2

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The solution to the system of equation -3x = 2y - 34 and 3y = 13 + 5x     is x = 4 and y = 11

An equation is an expression showing the relationship between two or more numbers and variables. An equation can either be linear, quadratic, cubic and so on depending on the degree.

Given the equations:

-3x = 2y - 34

multiply the equation by 3:

-9x = 6y - 102

-9x - 6y = -102      (1)

And:

3y = 13 + 5x    

multiply the equation by 2:

6y = 26 + 10x

-10x + 6y = 26         (2)

To solve by elimination method, add equation 2 and 1 to get:

-19x = -76

x = 4

Put x = 4 in the equation:

-3x = 2y - 34

-3(4) = 2y - 34

2y = 22

y = 11

The solution to the equation is x = 4 and y = 11

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The 10th term of the geometric sequence would be 3 × (-3)¹⁰.

Given is the geometric sequence -

- 9, 27, - 81 ...

We can write the common ratio as -

r = 27/-9 = -3

{r} = - 3                         ... Eq { 1 }

a{10} = (-9)(-3)⁹

a{10} = 3(-3)¹⁰

Therefore, the 10th term of the geometric sequence would be 3 × (-3)¹⁰.

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The solution to the initial-value problem is  y^4 = -2 + (c^4 + 2) e^28(1-cosx)

A differential equation is an equation which contains one or more terms and the derivatives of one variable (i.e., dependent variable) with respect to the other variable (i.e., independent variable) dy/dx = f(x) Here “x” is an independent variable and “y” is a dependent variable. For example, dy/dx = 5x.

Given Differential Equation is  y^3 dy/dx = (7y^4 + 14) sin(x)

we have to put y^4 = z and

then, reduce the differential equation to find out I.F value.

and next we have to find out general solution of z(I.F) = [tex]\int\limits\, (I.F)Q dx + c[/tex]

and then put y(0) to get c value

so, we get y^4 = -2 + (c^4 + 2) e^28(1-cosx)

Please refer below attached image for complete solving process.

Thus, the solution to the initial-value problem is  y^4 = -2 + (c^4 + 2) e^28(1-cosx)

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The number is: 9.

The number we are trying to find consists of two digits, with the units digit being 9.

So, let's call the number x. The number would be 10x + 9.

Next, we add 9 to the number, and the digits are interchanged. This means the number becomes 10 + x.

Now, we have two equations:

By comparing the two equations, we can deduce that x = 10 + x - 9.

So, the original number was 9, and after adding 9, it became 10 + 9 = 19, which has its digits interchanged.

Complete Question:

"A number consists of two digits, with the units digit being 9. If 9 is added to the number, its digits are interchanged. Find the number."

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The value of x1 = -4 and the value of x2 = 26/3 for the given inverse of the coefficient matrix.

The placement of numbers in rows and columns to create an array is known as a matrix.

A row is a horizontal arrangement, whereas a column is a vertical arrangement. Every integer in the matrix is referred to as an element, and its location is symbolized by A_mn.

Using the matrix, we can write the equation as:

AX = B

X = A^-1 B

[tex]\left[\begin{array}{c}X_1&X_2\end{array}\right] = \left[\begin{array}{cc}-1&-1\\2&\frac{5}{3} \end{array}\right] \left[\begin{array}{cc}6\\ -2\end{array}\right][/tex]

Using the matrix multiplication, we have:

[tex]\left[\begin{array}{c}X_1&X_2\end{array}\right] = \left[\begin{array}{cc}-4\\ \frac{26}{3} \end{array}\right][/tex]

Hence, the value of x1 = -4 and the value of x2 = 26/3 for the given inverse of the coefficient matrix.

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The solution to the quadratic equation x² + 4x + 4 = 0 is x = -2 and x = -2

An equation is an expression showing the relationship between two or more numbers and variables. An equation can either be linear, quadratic, cubic and so on depending on the degree.

The standard form of a quadratic equation is:

y = ax² + bx + c

Where a, b and c are constants

Given the quadratic equation:

x² + 4x + 4 = 0

x² + 2x + 2x + 4 = 0

x(x + 2) + 2(x + 2) = 0

(x + 2)(x + 2) = 0

x + 2 = 0; and x + 2 = 0

x = -2 and x = -2

The solution to the quadratic equation is x = -2 and x = -2

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The lateral area of the cone is 113.1 cm²

Let the radius of the circular base of the cone be r. Then the slant height, L of the cone is 4r.

The formula for the area of a circle is given by the formula

= πr^2.

Since the area of the circular base of the cone is 9π cm², we can write the following equation:

πr^2 = 9π

Dividing both sides by π, we get:

r^2 = 9

Taking the square root of both sides, we get:

r = 3

The lateral area of a cone can be calculated using the formula:

= πrL,

where L is the slant height of the cone.

Lateral area = π * r * L

= π * 3 * 4r

= 3 * 4 * 3 * π

= 36π

So, the approximate lateral area of the cone is 36π cm², which is approximately 113.1 cm².

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Answer: CDB

Step-by-step explanation: Congruent angles are angles that are identical to each other. For a more in-depth explanation, Congruent angles are basically when two angles "have the same shape and size, or if one has the same shape and size as the mirror image of the other". Out of the choices given, CDB is the most identical to BAC. If you rotate CDB with your mind, you'll notice that you get BAC.

Answer:not sure

Step-by-step explanation:

Answer:

See explanation and examples below.

Step-by-step explanation:

The probability that an event (desired outcome) will occur is the quotient of the number of ways the event can occur (desired outcomes) and the total number of possible outcomes.

For example, consider a die. A die is a 6-faced cube with numbers 1 through 6 on its faces.

The total number of possible outcomes is 6 since it can land with any face with numbers 1 through 6 facing up.

What is the probability if getting a 5?

Here the desired outcome is a 5. There is only one desired outcome since only 1 face has a 5. The total number of possible outcome is 6.

p(5) = 1/6

The probability of getting a 5 is 1/6.

Another example:

A spinner has 4 sections of equal size.

1 section is red.

1 section is blue.

1 section is green.

1 section is yellow.

What is the probability of landing on red?

Desired outcome: landing on red

Number of desired outcomes: 2

Total number of possible outcomes: 4

p(red) = 1/4

Using the same spinner, what is the probability of landing on yellow or green?

Landing on the green section or landing on the yellow section are both desired outcomes, so the number of desired outcomes is 2.

The total number of outcomes is 4.

p(yellow or green) = 2/4 = 1/2

The required General Solution Of the Given Differential Equation is Y = e^(-4x) * (X^2/4 + 7x/4 + X^2/2 + 7x + C') + X^2/4 + 7x.

Any equation with one or more terms and one or more derivatives of the dependent variable with respect to the independent variable is referred to as a differential equation (i.e., independent variable) dy/dx = f (x) In this case, the variables "x" and "y" are independent and dependent, respectively. For illustration, dy/dx = 5x.

The general solution to the differential equation Y' = 4Y + X^2 + 7 can be found by using an integrating factor. The integrating factor is e^(4x), and the solution is:

Y = e^(-4x) * ∫(e^(4x) * (X^2 + 7)) dx - X^2/4 - 7x + C,

where C is an arbitrary constant of integration. The solution can be simplified by solving the definite integral

= ∫(e^(4x) * (X^2 + 7)) dx,

which results in:

Y = e^(-4x) * (X^2/4 + 7x/4 + X^2/2 + 7x + C') + X^2/4 + 7x,

where C' is another arbitrary constant of integration.

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Answer:

a

Step-by-step explanation:

The histogram in question is a visual representation of the weights of guinea pigs. It indicates that the median weight is located in the interval between 250 and 300.

This is determined by first looking at the shape of the histogram. The histogram is approximately symmetrical, meaning that the median is going to be located in the middle of the data points. When looking at the intervals listed in the histogram, the interval between 250 and 300 is the middle interval, thus indicating that the median weight falls in this range.

In addition, the peak of the histogram is located in this interval, which further confirms that the median weight falls in the interval between 250 and 300. Overall, the interval between 250 and 300 contains the median guinea pig weight.

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The conversion from Fahrenheit to Celsius is 36.3 to 97.34.

Converting degrees of temperature from Celsius to Fahrenheit

Since boiling (hot) water is 21 degrees Fahrenheit and 0 degrees Celsius, respectively, the formula to convert between the two is

F = C x (9/5) + 32

A simple example can help you to understand the math in this situation. Suppose we need to convert 36.3 Celsius to Fahrenheit!

Entering the data into the converter equation will convert 36.3 degrees Celsius to Fahrenheit.

F = 36.3 x (9/5) +32

F 97.34 degrees

This means that the answer is after using the formula to change 36.3 Celsius to Fahrenheit:

36.3°C = 97.34°F

or

The conversion from Fahrenheit to Celsius is 36.3 to 97.34.

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The tank will contain 350 lb of salt when it is full of brine.

What is rate ?

A rate is the ratio between two related quantities in different units. If the denominator of the ratio is expressed as a single unit of one of these quantities.

The amount of salt in the tank can be calculated using the principle of mass conservation. The rate at which salt is entering the tank is equal to the rate at which it is flowing out, so the total amount of salt in the tank will remain constant.

Let x be the amount of salt in the tank when it is full. Then:

x = 50 + 1 * (400 - 100) = 50 + 300 = 350 lb

So, the tank will contain 350 lb of salt when it is full of brine.

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The tank will contain 350 lb of salt when it is full of brine.

A rate is the ratio between two related quantities in different units. If the denominator of the ratio is expressed as a single unit of one of these quantities.

The amount of salt in the tank can be calculated using the principle of mass conservation The rate at which salt is entering the tank is equal to the rate at which it is flowing out, so the total amount of salt in the tank will remain constant.

Let x be the amount of salt in the tank when it is full. Then:

x = 50 + 1 * (400 - 100) = 50 + 300 = 350 lb

So, the tank will contain 350 lb of salt when it is full of brine.

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On solving the provided question, we can say that the provided expression is = 5a -25  since it is linear expression, so it will have only one factor, a = 5

In mathematics, the integer m serves as the divisor (also known as factor n) of an integer n, which may be multiplied by the integers to get n. We may also state that n in this situation is a multiple of m. A number without a residue that divides another number is said to be a factor. In other words, if you multiply two integers to create a product, the numbers you multiply are factors of the product since the result is divisible by the numbers you multiply. Factors can be found using either division or multiplication.

the provided expression is = 5a -25

since it is linear expression, so it will have only one factor

5a -25

5a = 25

a = 5

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After resolving the force along u and v axes and determine the magnitudes of the components approx F(v) = 293N and F(u) = 566N.

The diagram of the question is given below:

It is necessary to resolve the stated force along the u and v axes. This actually suggests that the 800N force will finally be produced by the sum of the component forces along u and v.

Redraw the diagram in accordance with the force triangle.

According to the diagram:

θ = 180 - 30 - 15

θ = 135

The magnitude of the components will be created when the force along the u and v axes has been resolved.

Using the Sine Rule

F(v)/sin 15 = 800/sin 135 = F(u)/sin 30

Now solving the ratio by taking two ratio

F(v)/sin 15 = 800/sin 135

Multiply by sin 15 on both side, we get

F(v) = 800/sin 135 × sin 15

Using the calculator the value of sin 15 = 0.259 and sin 135 = 0.707

Now putting the value

F(v) = 800/0.707 × 0.259

F(v) = 207.2/0.707

F(v) = 293.1

F(v) = 293N(approx)

Now taking

F(u)/sin 30 = 800/sin 135

Multiply by sin 30 on both side, we get

F(u) = 800/sin 135 × sin 30

Using the calculator the value of sin 30 = 0.5 and sin 135 = 0.707

F(u) = 800/0.707 × 0.5

F(u) = 400/0.707

F(u) = 565.77

F(u) = 566N(approx)

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Answer:

m = 5/4

Step-by-step explanation:

Slope = rise/run or (y2 - y1) / (x2 - x1)

Pick 2 points (0, -3) (4, 2)

We see the y increase by 5 and the x increase by 4, so the slope is

m = 5/4

To find the distance DE across a river using indirect measurement, you can use the Angle-Angle (AA) Congruence Theorem.

A jogging path runs along the river from point C to point E ,passing through point A.

To find the distance DE across a river using indirect measurement, you can use the Angle-Angle (AA) Congruence Theorem.

This theorem states that if two angles of one triangle are congruent to two angles of another triangle, then the two triangles are congruent. In this scenario, you can measure the angles at A in both triangles ABC and ADE, and if they are congruent, you can conclude that the triangles are congruent by AA Congruence Theorem.

Knowing that ABC and ADE are congruent, you can use the Side-Side-Side (SSS) Congruence Theorem to find that their corresponding sides are congruent.

In particular, you can conclude that AB = AD, BC = DE, and AC = AE, which means that DE can be found by simply measuring AC and subtracting AB.

Therefore, we can use the Angle-Angle (AA) Congruence Theorem.

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For only one value of t particles have the same velocity, Option (b) is correct.

Velocity is a vector quantity in physics that describes the rate of change of an object's position in space. It is defined as the derivative of an object's position with respect to time, and it has both magnitude and direction.

Velocity is measured in units of length per unit time, such as meters per second (m/s). The magnitude of velocity is the speed of an object, which is the rate at which an object is moving, while the direction of velocity is the direction in which an object is moving.

Velocity is a crucial concept in mechanics and is used to describe the motion of objects and to analyze the interactions between objects. For example, the velocity of an object can be used to calculate its acceleration, which is the rate of change of its velocity. The velocity of an object can also be used to calculate its displacement, which is the change in its position over a certain period of time.

The velocity of the first particle is given by x1'(t) = cos(t), and the velocity of the second particle is given by x2'(t) = [tex]-2e^{(-2t-1)}[/tex]. To find when the two velocities are equal, we set x1'(t) = x2'(t) and solve for t:

cos(t) = [tex]-2e^{(-2t-1)}[/tex]

[tex]e^{(2t+1)}[/tex] = -1/2cos(t)

Since cos(t) is positive for 0 <= t <= , we can take the logarithm of both sides to get:

2t + 1 = ln(-1/2cos(t))

We now have an implicit equation that relates t to cos(t). To find how many solutions this equation has, we would need to graph the two functions and find their intersection points, if any.

Therefore, as the question asks for how many values of t the particles have the same velocity, the answer is (B) One.

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13. ∠1, ∠4, ∠5, and ∠8 are congruent

14. ∠1 and ∠3 are supplementary

15.  ∠1 and ∠4 are a pair of alternate interior angles

From the question, we are to name four angles that are congruent.

Congruent angles are the angles that have equal measure.

In the given diagram,

angle 1, angle 4, angle 5, and angle 8 area congruent.

That is,

m ∠1 ≅ m ∠4 ≅ m ∠5 ≅ m ∠8

14. Supplementary angles are angles that sum up to 180°

In the given diagram,

angle 1 and angle 3 are supplementary angles

15. We are to determine a pair of alternate interior angles

In the given diagram,

angle 3 and angle 6 are a pair of alternate interior angles

Hence, ∠1 and ∠4 are a pair of alternate interior angles

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The 1 liter of a quantity contains 4.22675 of cups.

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How frequently and how long is the system in use function

A system's reliability can be used to gauge how well it is operating and performing. It considers both the system's software and hardware components. This includes how long the system can function without experiencing any issues, how frequently it bounces back from a crash or failure, and how rapidly it reacts to information or service demands. The frequency and length of any system outages, as well as how quickly and dependably the system recovers from failure, must all be determined in order to assess a system's reliability. The user experience should also be taken into account because people may assess the reliability of a system based on how fast and effectively it answers to their requests. In order to determine a system's reliability with precision,

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The complete question is

reliability is measured as the amount of time the system is running and functioning properly. this includes the system’s hardware and software. What is the correct question for the statement above. How frequently and how long is the system in use function ?

The standard form of the equation is (x - -10)² + (y - -6)² = 5² with center (-10, -6) and radius 5.

Standard form of a circle is given by the equation,

(x - h)² + (y - k)² = r²

where, (h, k) is the center of the circle and r is the radius of the circle.

Given equation is,

x² + y² + 20x + 12y + 111 = 0

Rearranging the equation with like terms together,

(x² + 20x) + (y² + 12y) + 111 = 0

(x² + (2 × 10 x)) + (y² + (2 × 6 y)) + 111 = 0

Writing 111 = 100 + 36 - 25, we get,

(x² + (2 × 10 x)) + (y² + (2 × 6 y)) + (100 + 36 - 25) = 0

(x² + (2 × 10 x) + 100) + (y² + (2 × 6 y) + 36) - 25 = 0

We have the algebraic identity, a² + 2ab + b² = (a + b)².

(x² + (2 × 10 x) + 10²) + (y² + (2 × 6 y) + 6²) = 25

(x + 10)² + (y + 6)² = 5²

(x - -10)² + (y - -6)² = 5², which is the standard form.

Center = (-10, -6) and Radius = 5

Hence the the circle with the equation (x - -10)² + (y - -6)² = 5² has center (-10, -6) and radius 5.

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1,2,3,4,5,6-hexamethylcyclohexane is a six-membered ring molecule with six methyl groups attached to it. The arrangement of the methyl groups can be either axial or equatorial.

In an axial arrangement, the methyl groups are positioned along the axis of the ring and point up or down. An equatorial arrangement, on the other hand, has the methyl groups positioned on the equator of the ring, in a more coplanar arrangement. It is easier to distinguish between the two arrangements by visualizing the molecule in a chair conformation. In a chair conformation, the ring is twisted and two of the substituents are in axial positions and two are in equatorial positions. If all of the methyl groups in the molecule are in axial positions, they would point up or down in the chair conformation. If all of the methyl groups are in equatorial positions, they would be coplanar with the ring plane in the chair conformation.

In conclusion, the drawing of 1,2,3,4,5,6-hexamethylcyclohexane with all the methyl groups in axial positions shows the methyl groups pointing up or down in a chair conformation. The drawing with all the methyl groups in equatorial positions shows them to be coplanar with the ring plane in a chair conformation.

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The value of XY in the given trapezoid is 30 ft

A quadrilateral with at least one pair of parallel sides is called a trapezoid.

Given that, a trapezoid WXYZ we need to find XY,

We need that,

Midsegment of a trapezoid = M = 1/2 (b1 + b2), where b1 and b2 are parallel sides,

Therefore,

35 = (xy + 4xy/3) / 2

70 = 7xy / 3

210 = 7xy

xy = 30

Hence, the value of XY is 30 ft

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(b) The sampling distribution of the sample mean is a normal distribution with a center of 7.5 and spread equal to the standard error (SE) of the mean.

The standard error of the mean is calculated using the formula SE = SD/√n, where SD is the standard deviation of the population and n is the sample size. In this case, the sample size is 4, so the standard error of the mean is equal to SE = SD/√4.

(c) The probability of making a Type I error is equal to the probability of observing a sample mean outside the safe pH levels given that the population mean is 7.5. This can be calculated using the formula for a normal distribution:

P(x < x1 or x > x2) = P(x < x1) + P(x > x2)

where x1 and x2 are the lower and upper boundaries of the safe pH levels. To calculate the probability, we need to find the z-scores of x1 and x2 using the formula

z = (x - µ)/SE

where µ is the population means and SE is the standard error of the mean. In this case, µ = 7.5 and SE = SD/√4. We can then use the z-score to calculate the probability of observing a sample mean outside the safe pH levels. The probability of making a Type I error is equal to the sum of these two probabilities.

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