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Two sections of a class took the same quiz. Section A had 16 students who had...

Two sections of a class took the same quiz. Section A had 16 students who had a mean score of 84, and section B had 20 students who had a mean score of 90. Overall, what was the mean score for all students who took the quiz from sections A and B?

b.       A professor has recorded quiz grades for 20 students in his class, but one of the grades is no longer readable. If the mean score on the quiz was 80 and the mean of the 19 readable scores is 82, what is the value of the unreadable score?   

Math   Statistics-And-Probability   
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