# Question: The following relative frequency distribution describes the household incomes for

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?

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?

**View Solution:**## Answer to relevant Questions

Collecting data on traffic accident fatalities, the National Highway Traffic Safety Administration has found that 58.7% of the victims have 0.0% blood alcohol content (BAC), 5.8% of the victims have from 0.01 to 0.07% BAC, ...Of the adults in Jefferson County, 10% have had CPR training. For a randomly selected group of adults from this county, how large would the group have to be in order for the probability that at least one group member has had ...A corporate board of directors consisting of 15 persons is to form a subcommittee of 5 persons to examine an environmental issue currently facing the firm. How many different subcommittees are possible? The company in Exercise 6.50 has disciplined a worker who was suspected of pilfering tools and supplies from the plant. The very next day, the production line broke down 9 times. Management has confronted the union with ...Determine the mean, variance, and standard deviation of the following discrete probability distribution:Post your question