28. Bumped from a Flight Among 15,378 Delta airline passengers randomly selected, 3

were bumped from a flight against their wishes (based on data from the U.S. Department of

Transportation). Find the probability that a randomly selected passenger is involuntarily

bumped. Is such bumping unusual? Does such bumping pose a serious problem for Delta passengers

in general? Why or why not?

29. Death Penalty In the last 30 years, death sentence executions in the United States included

795 men and 10 women (based on data from the Associated Press). If an execution is

randomly selected, find the probability that the person executed is a woman. Is it unusual for

a woman to be executed? How might the discrepancy be explained?

30. Stem Cell Survey Adults were randomly selected for a Newsweek poll, and they were

asked if they "favor or oppose using federal tax dollars to fund medical research using stem

cells obtained from human embryos." Of the adults selected, 481 were in favor, 401 were opposed,

and 120 were unsure. Based on these results, find the probability that a randomly selected

adult would respond in favor. Is it unusual for an adult to be in favor?

31. Cell Phones in Households In a survey of consumers aged 12 and older conducted by

Frank N. Magid Associates, respondents were asked how many cell phones were in use by the

household. Among the respondents, 211 answered "none," 288 said "one," 366 said "two,"

144 said "three," and 89 responded with four or more. Find the probability that a randomly

selected household has four or more cellphones in use. Is it unusual for a household to have

four or more cell phones in use?

32. Personal Calls at Work USA Today reported on a survey of office workers who were

asked how much time they spend on personal phone calls per day. Among the responses, 1065

reported times between 1 and 10 minutes, 240 reported times between 11 and 30 minutes, 14

reported times between 31 and 60 minutes, and 66 said that they do not make personal calls.

If a worker is randomly selected, what is the probability the worker does not make personal

calls. Is it unusual for a worker to make no personal calls?

Constructing Sample Space. In Exercises 33-36, construct the indicated sample

space and answer the given questions.

33. Gender of Children: Constructing Sample Space This section included a table

summarizing the gender outcomes for a couple planning to have three children.

a. Construct a similar table for a couple planning to have two children.

b. Assuming that the outcomes listed in part (a) are equally likely, find the probability of getting

two girls.

c. Find the probability of getting exactly one child of each gender.

34. Gender of Children: Constructing Sample Space This section included a table

summarizing the gender outcomes for a couple planning to have three children.

a. Construct a similar table for a couple planning to have four children.

b. Assuming that the outcomes listed in part (a) are equally likely, find the probability of getting

exactly two girls and two boys.

c. Find the probability that the four children are all boys.

35. Genetics: Eye Color Each of two parents has the genotype , which consists

of the pair of alleles that determine eye color, and each parent contributes one of those

alleles to a child. Assume that if the child has at least one brown allele, that color will dominate

and the eyes will be brown. (The actual determination of eye color is somewhat more

complicated.)

brown>blue