The average of 15 numbers is 7. If the average of the first 8 numbers is 6.5 and

Question

The average of 15 numbers is 7. If the average of the first 8 numbers is 6.5 and the average of the last 8 numbers is 8.5, then the middle number is :

Options:

A . 23

B . 15

C . 13

D . 10

Answer: Option B
Answer: (b)Middle i.e. eighth number = 8 × 6.5 + 8 × 8.5 – 15 × 7 = 52 + 68 – 105 = 120 – 105 = 15

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