Question

Marks of 10 students in a class is given as:

15, 20, 25, 19, 12, 11, 13, 17, 18, 20. Then the mean is:​

Answer 1

$mean = \frac{total \: sum \: of \: observations}{no. \: of \: observations}$

$= \frac{15 + 20 + 25 + 19 + 12 + 11 + 13 + 17 + 18 + 20}{10}$

$= \frac{170}{10}$

$mean = 17$