Question: Find the standard deviation for the indicated sets of numbers. A calculator may be used. The electrical usages in Exercise 31 Data from Exercises 31

Find the standard deviation for the indicated sets of numbers. A calculator may be used.

The electrical usages in Exercise 31

Data from Exercises 31

In a particular month, the electrical usages, rounded to the nearest 100kW · h (kilowatt-hours), of 1000 homes in a certain city were summarized as follows:

500 600 700 800 900 1000 1100 1200 122 90 15 Usage

Find the mean of the electrical usage.

500 600 700 800 900 1000 1100 1200 122 90 15 Usage No. Homes 22 80 106 185 380

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