Find the correct mean height.

The mean height of 36 students of a class is 150.5 cm. Later on, it was detected that the height of one student was wrongly copied as 165 cm instead of 156 cm. Find the correct mean height.

Solution:

Mean height of 36 students of a class=150.5 cm
Total height = 150.5 × 36
= 5418 cm
Difference in height which was wrongly copied = 165 + 56
= 9 cm
Actual height = 5418 – 9
= 5409 cm
Actual mean height = 5409/36
= 150.25 cm
Therfore, the correct mean height is 150.25 cm.

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