Irwin Richards, a publisher of business textbooks, publishes in the areas of management, marketing, accounting, production, finance, and economics. The president of the firm is interested in getting a relative measure of the sizes of books in the various fields. Over the past three years, the average numbers of pages of books published in each area were Year 1 Year 2 Year 3 Management 835 956 774 Marketing 620 540 575 Accounting 440 490 525 Production 695 680 624 Finance 380 425 410 Economics 1,220 1,040 1,312 Using the quick and dirty methods discussed in Section 2.9, find multiplicative factors for each area giving the percentage above or below the mean number of pages.