The mean of 50 observations was 250 it was detected on checking that the value of 165 was wrongly copied as 115 find the coreect mean
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mean of 50 observation is 250
so the sum of 50 observations is
= 250 × 50
= 12500
wrong observation is 115
so sum of 49 observations is
12500 - 115
= 12385
sum of 50 observations with correct observation is 12385 + 165
= 12450
correct mean = 12450/ 50
= 1245/5
= 249
so the correct mean is 249
so the sum of 50 observations is
= 250 × 50
= 12500
wrong observation is 115
so sum of 49 observations is
12500 - 115
= 12385
sum of 50 observations with correct observation is 12385 + 165
= 12450
correct mean = 12450/ 50
= 1245/5
= 249
so the correct mean is 249
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