The average age of a group of 36 students is 23 years. Four students with average age 22 years leave the group. What is the average age in years (correct up to one decimal place) of the new group?
Answer & explanation
Correct answer: option 4
Sum of age of 36 students = 36 × 23 = 828 years
Sum of Age of 4 students = 4 × 22 = 88 years
Sum of remaining 32 students = 828 - 88 = 740 years
Average age of 32 students = \(\frac{740}{32}\) = 23.125
= 23.1 ( approx )