the mean of 5 observations is 15 if mean of the first three observations is 14 and that of the last three is 17 find the third observations
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sum of 5 obs is 75 sum of 1st three terms is 42 and last 3 its 51 so adding these 2 we get our new sum 93 but since the 3rd number is added up twice(1st 3 and last 3) so it needs to be removed from overall sum 75 so answer will.be 93-75=18
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