Question
The average age of a group of 15 students is 20 years.
Two persons of age 30 years and 44 years, left the group and 2 persons of age 25 years and 34 years, joined the group. Find the new average age of the group.Solution
Required average = {(15 × 20) – 30 – 44 + 25 + 34}/15 = 19 years
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