The mean and S.D. of a group of 50
observation are 40 and 5 respectively. If two
more observations 60 and 72 are added to the
set, find the mean and S.D. of 52 items.
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The mean and standard deviation of 20 observation are found to be 10 and 2 respectively. On rechecking it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation in each of the following cases :
(i) If wrong item is omitted
(ii) If it is replaced by 12
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