Question

# Out of 20 numbers , mean of 8 numbers is 40 and the mean of the remaining numbers is 50. Find the mean of 20 numbers.

A
60
B
46
C
40
D
45

Solution

## The correct option is B 46Given the mean of 8 numbers = 40 Hence the total of 8 numbers = 40 x 8 = 320 Given the mean of remaining  (20 - 8 = 12) numbers = 50 Total of 12 numbers = 50 x 12  = 600 Total of 20 observation = 600 + 320 = 920 Hence the mean of 20 observation =92020=46Mathematics

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