UGC NET Paper 1 GA 2012 Dec Solved Paper

Question : 9 of 60

Marks: +1, -0

The number of observations in a group is 40. The average of the first 10 members is 4.5 and the average of the remaining 30 members is 3.5. The average of the whole group is

4
$15/2$
$15/4$
6

Validate

Solution:

Observation of first 10 members = 4·5 × 10 = 45
observation of last 30 members = 3·5 × 30 = 105
total observation done by 40 members = 45 + 105 = 150
Average observation of the whole group

=150/40=15/4

Go to Question:

Prev Question

Next Question