researcher with A. C. Nielsen wanted to determine the number of television sets in households. He conducts a survey of 40 randomly selected households and obtains the following data: 1 1 4 2 3 3 5 1 1 2 2 4 1 1 0 3 1 2 2 1 3 1 1 3 2 3 2 2 1 2 3 2 1 2 2 2 2 1 3 1 a. Estimate the mean number of televisions in a household. b. Estimate the variance of the number of televisions in a household. c. Estimate the standard deviation of the number of television in a household.