The instructions for this vary a lot depending on your brand of calculator. The best way to find out is to dig out the instruction book (or Google it - most companies put their instruction books online now). Not all calculators have a variance function, but most scientific calculators do.
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using calculator , it will be equal to11.44
The variance is: 3.96
It is 15 and using a calculator is the quickest way
Using a calculator is one way and it is 28
Using a scientific calculator gives an answer of 223.60679774