According to the 2016 Consumer Expenditure Survey, Americans spend an average of $1,124 on cellular phone service annually. Suppose that we wish to determine if there are differences in cellular phone expenditures by age group. Therefore, samples of 10 consumers were selected for three age groups (18-34, 35-44, 45 and older). The annual expenditure (in dollars) for each person in the sample is provided in the table below. 18-34 35-44 45 and Older 1,455 969 1,135 215 434 956 1,556 1,892 400 2,145 1,500 1,374 1,621 1,377 1,244 994 1,056 825 1,937 1,922 763 1,200 1,350 1,192 1,567 1,686 1,305 1,490 1,515 1.510 (a) Compute the mean, variance, and standard deviation for each of the three samples. (Round your answers to two decimal places.) 18-34 35-44 45+ mean $ 1418 S 1370.1 $ 1070.4 variance 114163.74 x 203361.20 X 111866.04 standard deviation $ $ 422.15 X $ 334.46