Question

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

Answer 1

$\frac{(x) + (x + 3) + (x + 5) + (x + 7) + (x + 10)}{5} = 9 \\ \frac{5x + 25}{5} = 9 \\ \frac{5(x + 5)}{5} = 9 \\ x + 5 = 9 \\ x = 4$

Hence, the last observation is,

x+10 = 4+10= 14

Answer 2

Answer:

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