Question

A boy scored following marks in various class tests during a term; each test being marked out of 20.

15, 17, 16, 7, 10, 12, 14, 16, 19, 12 and 16

 What are his mean marks?

Answer 1

Arranging  the given data in ascending order: 

7, 10, 12, 12, 14, 15, 16, 16, 16, 17, 19 

Mean `(barx) = (x_1 + x_2 + x_3 + ....... +  x_n)/n`

= `154/11`

= 14