If the mean of 9, 8, x, 36, 12 is 15, find the value of x.
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Given :
. If the mean of 9, 8, 10, x, 12 is 15, find the value of x.
Solution :
Mean of the given numbers = (9 + 8 + 10 + x + 12)/5 = (39 + x)/5
According to the problem, mean = 15 (given).
Therefore, (39 + x)/5 = 15
⇒ 39 + x = 15 × 5
⇒ 39 + x = 75
⇒ 39 - 39 + x = 75 - 39
⇒ x = 36
Hence, x = 36.
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