[EX03-84] When was the last time you saw your doctor? That question was asked for the survey summarized in the following table.

Time Since Last Consultation 6 Months to Less Than Less Than 1 Year 6 Months 1 Year or More Younger than 28 years 413 192 295 Age 28–40 574 208 218 Older than 40 653 288 259

a. Find the marginal totals.

b. Express the frequencies as percentages of the grand total.

c. Express the frequencies as percentages of each age group’s marginal totals.

d. Express the frequencies as percentages of each time period.

e. Draw a bar graph based on the grand total.