a The number of campers who completed at least 3 obstacles increased by exactly 50% between the first week and final week. b The median number of obstacles completed stays the same between the first week and the final week. c The mean number of obstacles completed increased between the first week and the final week. d The range of obstacles completed increased by 2 between the first week and the final week.

The westins and the shermans live in the same city and pay the same sales tax rate, and both families made $14,000 in taxable purchases last year. if the westins made $86,000 and the shermans made $33,000 last year, is the sales tax in their city an example of a regressive tax? yes, because the westins and the shermans both paid the same sales tax rate. b. no, because the shermans paid a higher percentage of their income in sales tax than the westins did. c. no, because the westins and the shermans both paid the same sales tax rate. d. yes, because the shermans paid a higher percentage of their income in sales tax than the westins did.