# Question

The following table gives the frequency distribution of the amounts of telephone bills for August 2012 for a sample of 50 families.

Amount of Telephone Bill

(dollars) Number of Families

40 to less than 70............ 9

70 to less than 100........... 11

100 to less than 130........... 16

130 to less than 160........... 10

160 to less than 190.......... 4

Calculate the mean, variance, and standard deviation

Amount of Telephone Bill

(dollars) Number of Families

40 to less than 70............ 9

70 to less than 100........... 11

100 to less than 130........... 16

130 to less than 160........... 10

160 to less than 190.......... 4

Calculate the mean, variance, and standard deviation

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