The Average of 5 observation is 15. If three new observation 16.5, 18 and 14.5 be added. Then find the new average.

14.8
15.5
16.2
15.6

Correct Answer: 15.5

Explanation:

Total of 5 observations = 5 x 15 = 75
New sum = 75 + 16.5 + 18 + 14.5 = 124
New Average = 124 ⁄ 8 = 15.5

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