Question

The mean of a data containing thirty number is 71. if 5 is addrd to each number what will be the mean?

Answer 1

30 number mean 71

Then 30 ×71 = 2130

if each is add 5

then 30×5 =150 increased

new mean
=2130 +150 = 2280 /30 = 76 new mean

hope it helps you ...