Question

If the mean is 25 and n=100, what is Σ x?

A 25

B .25

C 250

D 2500

Answer 1

D 2500

Explanation:

the mean is

(x1 + x2 + x3 + ... + xn)/n

in our case that means

(x1 + x2 + x3 + ... + x100)/100 = 25

so, the sum of x (= x1 + x2 + x3 + ... x100) is

25×100 = 2500