# Question

The following relative frequency distribution describes the household incomes for families living in a suburban community:
Income Relative Frequency
Less than \$20,000........ 0.10
\$20,000–under \$40,000..... 0.20
\$40,000–under \$60,000..... 0.30
\$60,000–under \$80,000..... 0.25
\$80,000 or more........ 0.15
a. For a randomly selected household, what is the probability that its annual income is less than \$80,000?
b. If a household is known to have an income of at least \$20,000, what is the probability that its annual income is in the \$60,000–under \$80,000 category?
c. Two households are randomly selected from those whose income is at least \$40,000 per year. What is the probability that both of these households are in the \$80,000 or more category?

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