The mean of the first 8 observations is 18 and last 8 observation is 20.if the mean of all 15 observations is 19.find the eighth observation
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sum of first 8 observation=(18×8)=144
sum of last 8 observation=(20×8)=160
sum of total observation=(15×19)=285
so the 8th observation is (144+160)-285=19
sum of last 8 observation=(20×8)=160
sum of total observation=(15×19)=285
so the 8th observation is (144+160)-285=19
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