According to the 2016 Consumer Expenditure Survey, Americans spend an average of $1,124 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. Click on the datafile logo to reference the data. DATA file 18 - 34 35-44 45 and Older 1,355 969 1,135 115 434 956 1,456 1,792 400 2,045 1,500 1,374 1,621 1,277 1,244 994 1,056 825 1,937 1,922 763 1,200 1,350 1,192 1,567 1,586 1,305 1,390 1,415 1,510 a. Compute the mean, variance, and standard deviation for each of these three samples. Round your answers to one decimal place. 18-34 35-44 45+ Mean Variance Standard Deviation b. What observations can be made based on these data? The age group that spends the least amount on cellular phone service is biggest amount on cellular phone service is - Select your answer - Select your answer - and the age group that spends the The Graduate Management Admission Test (GMAT) is a standardized exam used by many universities as part of the assessment for admission to graduate study in business. The average GMAT score is 547 (Magoosh website). Assume that GMAT scores are bell-shaped with a standard deviation of 100. Use the empirical rule to answer the following. a. What percentage of GMAT scores are 647 or higher (to 1 decimal)? % b. What percentage of GMAT scores are 747 or higher (to 1 decimal)? % c. What percentage of GMAT scores are between 447 and 547 (to 1 decimal)? % d. What percentage of GMAT scores are between 347 and 647 (to 1 decimal)? %