RRB NTPC 29 April 2016 Paper

Question : 46 of 100

Marks: +1, -0

If the average age of 40 students in Class I is 10 years and the average age of 30 students in Class II is 12 years, find the average age (in years) for all students.

11
10.54
10.58
10.85

Validate

Solution:

(4) Total age of 40 students= 40 × 10 = 400
Total age of 30 students = 30 × 12= 360
Average of all students
=

(400+360)/70

(40+ 36)/7

76/7

= 10.85

Go to Question:

Prev Question

Next Question