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2 years ago

If the radius of a circle is 3.21 mm, what is the area of the circle? 32.35 mm2 10.08 mm2 20.162 129.42 mm2

Mathematics

1 answer:

N76 [4]2 years ago

6 0

Answer:

32.35mm2

Step-by-step explanation:

3.21 squared is 10.3041

and Multiply 10.3041 by pi(3.14) to get 32.354

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But we need to calculate the mean with the following formula:

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And replacing we got:

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Step-by-step explanation:

For this case we have the following data:

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And in order to estimate the population variance we can use the sample variance formula:

$s^2 = \frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}$

But we need to calculate the mean with the following formula:

$\bar X = \frac{\sum_{i=1}^n X_I}{n}$

And replacing we got:

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And thi is the best estimator for the population variance since is an unbiased estimator od the population variance $\sigma^2$

$E(s^2) = \sigma^2$

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If the radius of a circle is 3.21 mm, what is the area of the circle? 32.35 mm2 10.08 mm2 20.162 129.42 mm2​

If the radius of a circle is 3.21 mm, what is the area of the circle? 32.35 mm2 10.08 mm2 20.162 129.42 mm2