(1 point) The following table gives information on the amounts (in dollars) of electric bills
August 2009 for a sample of 50 families.
Amount of Electric Bill (dollars) Number of Families
0 to less than 40
3
40 to less than 80
24
80 to less than 120
13
120 to less than 160
8
160 to less than 200
2
Estimate the mean, variance, and standard deviation.
Note: Keep a minimum of 2 decimal places in your final answers when rounding.
a. The mean = 85.60
b. The variance =
c. The standard deviation =
