Question

57. The mean height of a group of 30 students is
150 cm. If a 150 cm tall student is included in
the group, then find the mean height of the new
group​

Answer 1

Answer:

Average height of 30 boys is 150㎝

Total height =30×150

=4500㎝

One value is copied 135㎝ which was 165㎝

So, total =4500+165−135

=4530

So, correct mean =304530=151㎝$$