Some tigers were weighed. The mean weight of the tigers was 230 kg.
x x\,x kg represents the weight of a tiger where ∑x=3450\sum x = 3450∑x=3450
Work out how many tigers were weighed.
Given ∑x2=841,250\sum x^2 = 841,250∑x2=841,250, work out the standard deviation.
