Question

The average height of 15 students is calculated as 75. But later it was found that the height of 1 student wrongly entered as 35 instead of 38 and another as 46 instead of 63.The correct average is

Answer 1

Total calculated height of 15 students $=15\times 75=1125$

Wrong Entries $38\to 35$ and $63\to 46$

Correct Total height $=1125+$($38-35$) +($63-46$) = $1145$

Correct Average height $\frac{1145}{15}=76.33$