According to the 2016 Consumer Expenditure Survey, Americans spend an average of $1124 on cellular phone service annually (U.S. Bureau of Labor Statistics website). 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 for each person in the sample is provided in the table below.?

a. Compute the mean, variance, and standard deviation for the each of these three samples.?

b. What observations can be made based on these data?

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45 and Older 18-34 35-44 1355 969 1135 115 434 956 1456 1792 400 2045 1500 1374 1621 1277 1244 994 1056 825 1937 1922 763 1200 1350 1192 1567 1586 1305 1510 1390 1415