# Mean, variance and standard deviation

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The sales records for a real estate company are given. From the sample data, the following frequency distribution has been developed.

Sale Price (1000's) Number of Houses Sold (frequency)

20-39 1

40-59 2

60-79 4

80-99 2

100-119 1

Calculate the mean, variance and standard deviation for the grouped data. Based on the previous answer, how much could the realtor expect to make if he sells 3 houses?

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##### Solution Summary

The mean, variance and standard deviation of a real estate company's number of houses sold is analyzed.

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