The area of a circle is given by πr2, where r is the radius of the circle. If we use rounding to the nearest whole number, what is a reasonable estimate of the area of a circle with a radius of 4.89 cm?

75cm^2

Step-by-step explanation:

Check attachment

To figure out the variance, divide the sum, 82.5, by N-1, which is the sample size (in this case 10) minus 1. The result is a variance of 82.5/9 = 9.17. Standard deviation is the square root of the variance so that the standard deviation would be about 3.03.

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