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Chapter 4: Q19 (page 175)
In Exercises 5–36, express all probabilities as fractions.
ZIP Code If you randomly select five digits, each between 0 and 9, with repetition allowed, what is the probability you will get the author’s ZIP code?
The probability of getting the author’s ZIP code is equal to.
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Finding Complements. In Exercises 5–8, find the indicated complements.
Flying In a Harris survey, adults were asked how often they typically travel on commercial flights, and it was found that , where N denotes a response of “never.” What does represent, and what is its value?
At Least One. In Exercises 5–12, find the probability.
Three Girls Find the probability that when a couple has three children, at least one of them is a girl. (Assume that boys and girls are equally likely.)
In Exercises 25–32, find the probability and answer the questions.
Genetics: Eye Color Each of two parents has the genotype brown/blue, 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 more complicated than that.)
a. List the different possible outcomes. Assume that these outcomes are equally likely.
b. What is the probability that a child of these parents will have the blue/blue genotype?
c. What is the probability that the child will have brown eyes?
In Exercises 9–12, assume that 50 births are randomly selected. Use subjective judgment to describe the given number of girls as (a) significantly low, (b) significantly high, or (c) neither significantly low nor significantly high.
47 girls.
In Exercises 13–20, express the indicated degree of likelihood as a probability value between 0 and 1.
Job Applicant Mistakes Based on an Adecco survey of hiring managers who were asked to identify the biggest mistakes that job candidates make during an interview, there is a 50–50 chance that they will identify “inappropriate attire.”
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