THE MEAN OF 20 ,18,13,12 ,x and 10 is 15 find the vale of x
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mean = sumof observation / total observation
20 + 18 + 13 + 12 + x + 10 / 6 = 15
73 + x / 6 = 15
73 + x = 15 * 6
73 + x = 90
x = 17
20 + 18 + 13 + 12 + x + 10 / 6 = 15
73 + x / 6 = 15
73 + x = 15 * 6
73 + x = 90
x = 17
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