Question

Thewhat is the difference between the mean and median of the first four prime numbers that are more than 4?

The mean=9 and the median =11.so the ans should be -2.but in the answer sheet the ans is 0..how?

Answer 1

let me see

5 7 11 13

I think

mean = (5+7+11+13)/2 = 36/4 = 9

median = (7+11)/2 = 9

When there are an even number of items it is impossible to pick the same number above and below any particular one. Therefore you take the average of the two middle ones.