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VMariaS [17]
3 years ago
11

A(r) is a function that gives the area of a circle with radius r. It can be written in equation form as A(r) = 3.14r2. What is t

he value of A(3)?
Mathematics
1 answer:
vlada-n [284]3 years ago
4 0
Sub in 3 for r
A(3) = 3.14 * 3^2
A(3) = 3.14 * 9
A(3) = 28.26
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notsponge [240]

Answer:

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Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

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In this problem, we have that:

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What is the probability that a person selected at random will have an IQ of 110 or higher?

This is 1 subtracted by the pvalue of Z when X = 110. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{110 - 100}{5}

Z = 2

Z = 2 has a pvalue of 0.0228

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