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

Question

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

Philoid · Accepted Answer

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.