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 $5,000$9,999, 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 are spread fairly evenly over that range. (1)) The families that earn between $35,000 and $75,000 are spread fairly evenl},r over that range. (c) The graph is a histogram