The Dow Jones average provides an indication of overall market level. The changes in this average, from year end, from 1969 to 1970 through 2010 to 2011 are summarized in the following frequency table, where the left-hand endpoint is excluded.

(a) Calculate the relative frequency for the intervals.
(b) Plot the relative frequency histogram. (Since the intervals have unequal widths, make the height of each rectangle equal to the relative frequency divided by the width of the interval.)
(c) What proportion of the changes are not positive?
(d) Comment on the location and shape of the distribution.

Transcribed Image Text:

Yearly Changes in the Dow Jones Average Change in DJ Average Frequency (-4500,-1600] C-1600, -850] C-850, -250 ] (-250, 0] (0, 250] (250, 850] 13 (850, 1650 (1650, 2450] Total 42