Three groups of students have average ages 18, 20, and 22 respectively. If the…
2025
Three groups of students have average ages 18, 20, and 22 respectively. If the number of students in the
three groups is in the ratio 2:3:5, what is the overall average age?
- A.
19.6
- B.
20.6
- C.
15.6
- D.
14.6
Attempted by 24 students.
Show answer & explanation
Correct answer: B
The weighted average is (2 x 18 + 3 x 20 + 5 x 22)/(2 + 3 + 5) = 206/10 = 20.6.