Q. 104.6( 15 Votes )
The mean of 5 observations is 50. One of the observations was removed from the data, hence the mean became 45. Find the observation which was removed.
We know that
⇒ Sum of observations = Mean ×Total number of observations
Sum of 5 observations = 50×5=250
Sum after removing one observation = 4×45=180
⇒ Removed observation = sum of 5 observations – Sum after removing one observation
⇒ Removed observation = 250 -180 =70
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