The average of 11 numbers is 10.9. If the average of first six is 10.5 and that

Question

The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.4 the sixth number is?

Options:

A . 11.0

B . 11.3

C . 11.4

D . 11.5

Answer: Option D

1 to 11 = 11 * 10.9 = 119.9

1 to 6 = 6 * 10.5 = 63

6 to 11 = 6 * 11.4 = 68.4

63 + 68.4 = 131.4 “ 119.9 = 11.5

6^th number = 11.5

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