Question 221123
Suppose that the mean score of a class of 28 students was 74. The 18 male students in the class had a mean score of 66. What was the mean score for the 10 female students? 
I don't understand how to find this answer.
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Total of all the scores must have been 28*74= 2074
Total of all the men's scores must have been 18*66 = 1188 
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That leaves 2074-1188 = 886 score points supplied by the girls.
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So mean girl's score must have been 886/10 = 88.6
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Cheers,
Stan H.