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ehidna [41]
3 years ago
13

What is the area of a circle with a diameter of 6 in? (A)12π in (B)36π in2 (C)9π in2 (D)36 in2

Mathematics
1 answer:
Vilka [71]3 years ago
7 0

Answer:

Choice C correct answer.

Step-by-step explanation:

From the question statement, we observe that

d=6 in

r=d/2

so, r=6/2=3 in

The formula to find area is

A = πr²

Putting the value of radius, we get

A = π(3)²

A= 9π in²


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Using the normal distribution, it is found that there is a 0.877 = 87.7% probability of a bulb lasting for at most 569 hours.

<h3>Normal Probability Distribution</h3>

The z-score of a measure X of a normally distributed variable with mean \mu and standard deviation \sigma is given by:

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

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The probability of a bulb lasting for at most 569 hours is the <u>p-value of Z when X = 569</u>, hence:

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

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More can be learned about the normal distribution at brainly.com/question/24663213

#SPJ1

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