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Finding mean, variance and standard deviation from a 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 a good example of what I can do in the future for real estate.

Class Frequency

46-48 22

49-51 23

52-54 23

55-57 9

58-60 7

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The expert finds the mean, variance and standard deviation from a frequency distribution.

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