Q. 163.6( 8 Votes )

The mean score of 25 observations is 80 and the mean score of another 55 observations is 60. Determine the mean score of the whole set of observations.

Answer :

Given,


Mean score of 25 observations = 80


Total score of 25 observations = 25 × 80 = 2000.


Mean score of another 55 observations = 60


Total score of 55 observations = 55 × 60 = 3300.


Total observations = 55 × 25 = 80


Mean score of whole set of observations =



Hence, Mean score of whole set is 66.25.


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