Question

The marks(out of 100) obtained by a group of students in Mathematics test are 81 ,72, 90, 90, 85, 86, 70, 93, and 71. Find the mean marks obtained by the group of students.

Answer 1

the mean of thr sum is 82

Answer 2

mean = sum of observations/ total no. of observations
81+72+90+90+85+86+70+93+71/9
738/9
mean = 82