Question

The following information relates to a sample of size 60: ∑x²=18000, ∑x = 960.

The variance is

A. 6.63
B. 16
C. 22
D. 44

Answer 1

Now we know standard deviation can be written as,

But given ∑x²=18000, ∑x = 960, N=60, substituting these corresponding values, we get

Now for variance we will square on both sides, we get

σ²=44

Hence the required variance is 44.