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2 years ago

5

Mrs. Sung gave a test in her trignonmetry class. The scores were normally distributed with a mean of 85 and a standard deviation

of 3.
What percent would you expect to score between 88 and 91? Round answer to the nearest tenth.

1 answer:

lisov135 [29]2 years ago

5 0

Answer and explanation:

67% as it's +/- one standard deviation from the mean

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3 years ago

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tangare [24]

Answer:

$\displaystyle \rm A_{ \text{c - pentagon}} =41$

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Step-by-step explanation:

we have a square and a triangle

we want to figure out the area and the perimeter of the pentagon

to figure out the area of the pentagon we can use the given formula:

$\displaystyle \rm A_{ \text{c - pentagon}} = A_{ \text{squre}} - A_{ \text{triangle}}$

let's figure out $A_{\rm square}$ :

since the given shape is a square Every angle of its 90° Thus the triangle is a right angle triangle

therefore the height is 4

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substitute h and b

$\displaystyle A _{ \rm triangle} = \frac{1}{2} \times 4 \times 4$

reduce fraction:

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simplify multiplication:

$\displaystyle A _{ \rm triangle} = 8$

likewise square

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substitute s:

$\displaystyle A _{ \rm squre} = {7}^{2}$

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to figure out perimeter

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2 years ago

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2 years ago

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2 years ago

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