Question

The average of 8 numbers is 13 If each number is decreased by 2, the average of the new set of numbers is.
a) 8
b) 11
c) 12
d)None​

Answer 1

if we decrease '2' from each no we decrease 2 for 8 times

therefore

2 x 8 = 16

lets suppose addn of initial no = 8 x 13 = 104

we will subtract 2 from each no so will subtract total 16

therefore new average = 104-16/8 = 88/8 = 11

so option b) 11 is ryt

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