Question

The mean of 10 observations is 20 if 9 of the observations are 16, 20, 18, 17 , 22, 16, 15, 20, 17 fine the 10th observation

Answer 1

x1 + x2 + x3 + x4 + x5 + x6 + x7 + x8 + x9 + x10
--------------------------------------------------------------------
...................................... 10

= 20

so x1 + ... + x10 = 200

161 + x10 = 200

so x10 = 39.....

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