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Question
If the mean of 8, 10, 7, x + 2 and 6 is 9, find the value of x.
Solution
The mean 8, 10, 7, x + 2 and 6 is 9
∴ `(8+10+7+"x"+2+6)/5=9`
⇒ `("x"+33)/5=9`
⇒ x + 33 = 9 × 5
⇒ x = 45 − 33
⇒ x = 12
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