Question

The average height of a class of 14 boys is 5.3 feet. A new boy admitted to the class, the new average of height now becomes 5.25. What is the height of the new boy ?

Answer 1

the average height of the boy is3.95 it is by subtracting the height

Answer 2

Average height of 14 boys = 5.3 feet

As, total height = Average Height * Number of Boys

Therefore, Total height of 14 boys = 5.3 * 14 = 74.2 feet

After admission of new boy, Boys = 15; Average Height = 5.25 feet

So, Total height of 15 boys = 5.25 * 15 = 78.75 feet

So, after the admission of the new boy, change in total height

= 78.75 - 74.2 = 4.55 feet

Answer : The height of the new boy is 4.55 feet.

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