The Dow Jones average provides an indication of overall market level. The changes in this average, (current year) - (previous year) summarize the year's activity. Changes for 48 recent years yield the following frequency table. The left-hand endpoint is excluded.

(a) Calculate the relative frequency for the intervals.
(b) Plot the relative frequency histogram.
(c) What proportion of the changes are not positive?
(d) Comment on the location and shape of the distribution.

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Yearly Changes in the Dow Jones Average Change in DJ Average Frequency (-5000, -1500 ] (-1500, -500] (-500, 0] (0, 500] (500, 1500] (1500, 5000] Total ~~ 2 2 9 17 11 7 48