The average age of 120 members of a society is 62.5 years. By addition of 30 new members, the average age becomes 58.2 years. What is the average age of the newly joined members?
Answer & explanation
Correct answer: option 2
ATQ,
Sum of ages of 120 members of society = 120 x 62.5 = 7500
Sum of ages when new 30 members are added = 150 x 58.2 = 8730
Sum of ages of 30 new members = 8730 - 7500 = 1230
Average age of 30 newly joined members = 41 years