Question

The mean of 3,6,7,5,x,8,10,13 is 56.Find the value of x.
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Answer 1

mean = (3 + 6 + 7+5+x+8+10+13)/ 8

56 = (52 + x) / 8

448 = 52 + x

x = 396

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Answer 2

Mean=xi/n

56=3+6+7+5+x+8+10+13/8
56=52+x/8
8*56=52+x
448=52+x
448-52=x
x=396

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