If the mean of five observations x, x + 2, x + 4, x + 6, x + 8 is 11. Find the mean of first three observations.

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Solution

We have,
$11 = \frac{x + (x + 2) + (x + 4) + (x + 6) + (x + 8)}{5} 11 = \frac{5 x + 20}{5} 35 = 5 x x = 7$ (1 mark)
Now, the first three observations are 7, 9 and 11
Their mean would be
$\frac{7 + 9 + 11}{3} \frac{27}{3} = 9$
(1 mark)

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