# Question

The costs per load (in cents) of 35 laundry detergents tested by a consumer organization are shown here.

Class limits Frequency

13–19 ..........2

20–26 ..........7

27–33 ........12

34–40 ..........5

41–47 ..........6

48–54 ..........1

55–61 ..........0

62–68 ..........2

Find the variance and standard deviation.

Class limits Frequency

13–19 ..........2

20–26 ..........7

27–33 ........12

34–40 ..........5

41–47 ..........6

48–54 ..........1

55–61 ..........0

62–68 ..........2

Find the variance and standard deviation.

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