8. The figure on the next page (adapted from the San Francisco Chronicle, May 18

Question

8. The figure on the next page (adapted from the San Francisco Chronicle, May 18, 1992) shows the distribution of American families by income. Ranges include REVIEW EXERCISES 53 the left endpoint but not the right. For example, 3.7% of the families had in- comes in the range $0-$4,999, 5.8% had incomes in the range ss,000-S9999, and so forth. True or false, and explain: (a) Although American families are not spread evenly over the whole in- come range, the families that earn between $10,000 and $35,000 ane spread fairly evenly over that range. (b) The families that earn between $35,000 and $75,000 are spread fairly evenly over that range. (c) The graph is a histogram.

Explanation / Answer

A false. Only only about 23% families fall in this range

B True. The reason is more firm earn that amount and us spread evenly

C True. Here area is proportional to frequency of the variable and width us equal to class interval

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