The mean of 12, 10, x, 20 and 18 is 17. Find x.
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25 is the answer of that question
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We add all the terms and then divide the whole thing by the number of terms to find mean.
(12 + 10 + x + 20 + 18)/5 = 17
(60 + x)/5 = 17
60 + x = 85
x = 25
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