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Question 2
Calculate the mean of the scores of 20 students in a mathematics test
Marks10202030304040505060Number of students24761

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Solution

We first, find the class mark xi of each class and then proceed as follows
Marks Classmarks (xi) Frequency (fi)fixi102015230203025410030403572454050456270506055155fi=20fixi=700
Therefore, mean(¯x)=fixifi=70020=35
Hence, the mean of scores of 20 students in mathematics test is 35.

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