first we find the mean (average) (6 + 10 + 14 + 2) / 4 = 32/4 = 8
now subtract the mean value from every data value....and square it. 6 - 8 = -2....-2^2 = 4 10 - 8 = 2....2^2 = 4 14 - 8 = 6...6^2 = 36 2 - 8 = -6...-6^2 = 36
now find the mean of those numbers (4 + 4 + 36 + 36) / 4 = 80/4 = 20 <== ur variance
