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How to find the variance and standard deviation in this form Pupils Per Teacher The frequency distribution shows the average number of pupils per teacher

How to find the variance and standard deviation in this form

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Pupils Per Teacher The frequency distribution shows the average number of pupils per teacher in some states of the United States. Find the variance and standard deviation for the data. Round your answers to one decimal place. Class limits Frequency 9-11 2 12-14 20 15-17 18 18-20 7 21-23 2 24-26

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