Average of 12 positive numbers is 12. On changing one of the number, the new average is 10.8, What w

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15 Jun 2012 average

Average of 12 positive numbers is 12. On changing one of the number, the new average is 10.8, What will be the difference of the new and previous value of that number

OPtion

1) 9.6
2) 9.8
3) 10.4
4) 10.8
5) 12.6
6) 14.4
7) 14.8
8) 15.2
9) 15.4
10) 16.2

Solution

total of first 12 numbers = 12*12 = 144
total of 12 numbers after changing one number = 10.8*12 = 129.6
so difference = 14.4

Correct Option: 6 Best Solution (0)