Question
The average age of a group of 20 students is 40
years. Two persons of age 44 years and 33 years, left the group and 2 persons of age 45 years and 72 years, joined the group. Find the new average age of the group.Solution
Required average = {(20 × 40) – 44 – 33 + 45 + 72}/20 = 42 years
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