Question

The mean height of 10 students is 151.8 cm. Then 2 more students of height 157.6 and 154.4 join them. What is the new mean height.

Answer 1

Mean height of 10 students = 151 . 8 cm
Mean = Sum ÷ 10
Sum = Mean × 10
Sum = 151 . 8 × 10
= 1518
New Mean = 1518 + 157.6 + 154.4÷12
= 152.5