There are 90 female members and 60 male members in the club. If the average age of female members is 35 years, and the average age of male members is 45 years, then find the average age (in years) of the whole club.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 39.
Average = Sum of observations/Number of observations
Now,
Total age of female members = 90 × 35 = 3150 years
Total age of male members = 60 × 45 = 2700 years
Total age = Total age of female members + Total age of male members
⇒ 3150 + 2700 = 5850 years
Total members = Number of female members + Number of male members
⇒ 90 + 60 = 150
Average age = 5850/150 = 39 years