Frequency distribution: finding the mean and variance
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The following distribution shows the prices of books at a college.
Class Frequency(Fi) Class Mark(Xi) FiXi
10-20 10 15 150
20-30 15 25 375
30-40 15 35 525
40-50 20 45 900
Find the mean and the variance
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Solution Summary
This solution shows how to find the mean and variance from data summarized in a frequency distribution.
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