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Question

Question 1
Find the mean of the distribution.
Class133557710Frequency9222717

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Solution

We first, find the class mark xi of each class and then proceed as follows.
Class & Class marks (xi) Frequency (fi)fixi1329183542288576271627108.517144.5fi=75fixi=412.5
Therefore, mean (¯x)=fixifi=412.575=5.5
Hence, mean of the given distribution is 5.5.

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