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Variance-standard deviation from frequency distribution

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Given the following frequency distribution, find the mean, variance, and standard deviation.

Please show all of your work so I can see how to do this for the future. This one is good example of what I can do in future for real estate.

Class Frequency

46-48 22

49-51 23

52-54 23

55-57 9

58-60 7

Reference no: EM1389795

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