RRB NTPC Mains or Stage 2 Model Paper 5 with solutions

Question : 29 of 120

Marks: +1, -0

In a class, there are 32 boys and 28 girls. The average age of the boys in the class is 14 yr and the average age of the girls in the class is 13 yr. What is the average age of the whole class ? (Rounded off to two digits after decimal)

13.50
13.53
12.51
13.42

Validate

Solution:

(b) Average age of the whole class

={32× 14 ×28× 13}/{32 +28}={448+ 364}/60

=812/60= 13.53yr

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