Tornadoes kill many people every year in the United States. The yearly number of lives lost during the 59 years 1950 through 2008 are summarized in the following table.

Number of Deaths Frequency 24 or less 2 25–49 20 50–74 18 75–99 7 100–149 6 150–199 2 200–249 1 250 or more 3 Total 59

(a) Calculate the relative frequency for the intervals [0, 25), [25, 50) and so on where the right-hand endpoint is excluded.
Take the last interval to be [250, 550).

(b) Plot the relative frequency histogram.
(Hint: 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 years had 49 or fewer deaths due to tornadoes?

(d) Comment on the shape of the distribution.