For the first three months of 2012, the stock market put up its best first-quarter performance in

over a decade ( April 9, 2012). The accompanying table shows a portion of the

daily price index for the Dow Jones Industrial Average (DJIA) over this period.

For questions (a), (b) and (c), you could use any software to draw the required plots. However,

only Minitab is allowed to answer question (d).

(a) Construct a frequency distribution and histogram for the DJIA price index. Use five classes

with upper limits of 12,500, 12,750, etc. On how many days during this quarter was the

DJIA less than 12,500?

(b) Construct a relative frequency polygon. Is the distribution symmetric? If not, is it positively

or negatively skewed?

(c) Construct an ogive. Approximate the percentage of days that the DJIA was less than 13,000.

(d) Construct three additional histograms for the DJIA price index using the number of classes

as 3, 8, and 10, respectively, by using Minitab**.