If a sample of 66 employees were taken from a population of 820 employees,

s2 could refer to the variance of how many of the employees' salaries?

O

A. Neither 66 nor 820

O B. 66

O C. Both 66 and 820

O D. 820

b. 66

Step-by-step explanation:

s2 Could refer to the variance of the 66 employees' salaries

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)