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WINSTONCH [101]
3 years ago
5

The number of calories in a 1-ounce serving of a certain breakfast cereal is a random variable with mean 110 and standard deviat

ion 10. The number of calories in a cup of whole milk is a random variable with mean 140 and standard deviation 12. For breakfast, you eat 1 ounce of the cereal with 1/2 cup of whole milk. Let T be the random variable that represents the total number of calories in this breakfast.
The standard deviation of mathrmT is:

a. 22
b. 16
c. 15.62.
d. 11.66
e. 4
Mathematics
1 answer:
Sergio [31]3 years ago
8 0

We want to find the standard deviation of a sum to know the standard deviation on the number of calories on a breakfast.

We will see that the correct option is b; 16.

First, we know that:

  • 1 Lb of cereal has a standard deviation of 10 calories.
  • 1 cup of milk has a standard deviation of 12 calories.

The breakfast is:

1 Lb of cereal and 1/2 cup of milk.

The 1Lb of cereal adds 10 calories to the standard deviation.

And if a cup of milk has a standard deviation of 12 calories, then half a cup has half that standard deviation, so it is 6 calories.

And in <u>addition or subtraction</u>, the standard deviation of the operation is given as the<u> sum of the</u><u> standard deviation </u><u>of each element</u>, so the total standard deviation of the breakfast is:

10 calories + 6 calories = 16 calories.

So the correct option is b.

If you want to learn more, you can read:

brainly.com/question/12402189

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Answer:

The horizontal displacement is 11 units, the vertical displacement is 9 units, and the projection angle is 39.3 degrees.

Step-by-step explanation:

We can start using the definition of displacement in one dimension between any 2 points which is the difference between them, so we have

\Delta s = s_2-s_1

And apply it to get the horizontal and vertical displacements.

Once we have found them, we can use trigonometric functions to find the projection angle with respect the horizontal.

Linear displacements.

Using the definition of displacement, we can write the horizontal displacement as

\Delta x = x_2-x_1

So we can use the given points P1:(x_1,y_2)  \text{  and  } P_2: (x_2,y_2) on the displacement formula

\Delta x = 15-4\\\Delta x = 11

In the same manner we can look at the y components of those points to find the vertical displacement

\Delta y = 17-8\\\Delta y =9

Thus the horizontal displacement is 11 units and the vertical displacement is 9 units.

Projection angle.

The projection angle with respect the horizontal is the angle that is made between the line that connects the points P1 and P2 and the horizontal, so we can use the linear displacements previously found to write

\tan(\theta) = \cfrac{\Delta y}{\Delta x}

Solving for the angle we get

\theta = \tan^{-1}\left(\cfrac{\Delta y}{\Delta x}\right)

Replacing values

\theta = \tan^{-1}\left(\cfrac{9}{11}\right)

Which give us

\theta = 39.3^\circ

So the projection angle is 39.3 degrees.

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qwelly [4]

Answer:

<h2>45 in²</h2>

Step-by-step explanation:

Formula:

area of a parallelogram = base × height

==================================

By reading the figure :

base = 15

height = 3

Therefore,

The area of the parallelogram = 15 × 3

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Answer:

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Step-by-step explanation:

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I = Prt

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