Question

If the mean of the observations x, x+3, x+5, x+7, x+10 is 9, find the last observation

Answer 1

Answer:

Mean = sum/no. of observations

9 = (x + x + 3 + x + 5 + x + 7 + x + 10)/5

45 = 5x + 25

45 - 25 = 5x

5x = 20

x = 4

Last observation = x + 10 = 4 + 10 = 14

14 is the answer

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