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Arithmetic Mean

The average a...

Question

The average age of a jury of 5 is 40 years. If a member aged 35 resigns and a man aged 25 becomes a member, then the average age of the new jury is:

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Solution

Total of ages of jury of 5 = 40 x 5 = 200
A member resigns the total reduces = 200 – 35 = 165
When a new member joins, the total increases = 165 + 25 = 190
Average age of the new jury is
= 190/5
= 38.

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