Question
The average age of a group of 20 students is 50
years. Two persons of age 50 years and 30 years, left the group and 2 persons of age 70 years and 90 years, joined the group. Find the new average age of the group.Solution
Required average = {(20 × 50) – 50 – 30 + 70 + 90}/20 = 54 years
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