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Chapter 4: Q18 (page 143)

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.”

Short Answer

Expert verified

The probability of identifying “inappropriate attire” as a mistake is 0.5.

Step by step solution

01

Given information

“Inappropriate attire” is identified as one of the biggest mistakes made by candidates in job interviews.

It is given that there is a 50-50 chance of this being identified as a mistake.

02

Define probability

Probability is a value that lies in the range of 0 and 1 (both inclusive).

It has the formula

PE=NumberofoutcomesinfavourofETotalnumberofoutcomes

03

Calculate the probability 

Let E be the event that “inappropriate attire” is identified as a mistake.

There is a 50-50 chance that event E happens. It meansthe chance of this event is 50 in 100 trials (subjects’ response).

In decimal, the probability value is

PE=50100=0.5

Therefore, the probability of “inappropriate attire” being identified as a mistake is 0.5.

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Most popular questions from this chapter

In Exercises 9–20, use the data in the following table, which lists drive-thru order accuracy at popular fast food chains (data from a QSR Drive-Thru Study). Assume that orders are randomly selected from those included in the table.

McDonald’s

Burger King

Wendy’s

Taco Bell

Order Accurate

329

264

249

145

OrderNotAccurate

33

54

31

13

Fast Food Drive-Thru Accuracy If one order is selected, find the probability of getting food that is not from McDonald’s.

In Exercises 25–32, find the probability and answer the questions. Social Networking In a Pew Research Center survey of Internet users, 3732 respondents say that they use social networking sites and 1380 respondents say that they do not use social networking sites. What is the probability that a randomly selected person does not use a social networking site? Does that result suggest that it is unlikely for someone to not use social networking sites

In Exercises 25–32, find the probability and answer the questions.. Guessing Birthdays On their first date, Kelly asks Mike to guess the date of her birth, not including the year.

a. What is the probability that Mike will guess correctly? (Ignore leap years.)

b. Would it be unlikely for him to guess correctly on his first try?

c. If you were Kelly, and Mike did guess correctly on his first try, would you believe his claim that he made a lucky guess, or would you be convinced that he already knew when you were born?

d. If Kelly asks Mike to guess her age, and Mike’s guess is too high by 15 years, what is the probability that Mike and Kelly will have a second date?

Probability of At Least One Let A = the event of getting at least 1 defective iPhone when 3 iPhones are randomly selected with replacement from a batch. If 5% of the iPhones in a batch are defective and the other 95% are all good, which of the following are correct?

a. = (0.95)(0.95)(0.95) = 0.857

b. P(A) = 1 - (0.95)(0.95)(0.95) = 0.143

c. P(A) = (0.05)(0.05)(0.05) = 0.000125

At Least One. In Exercises 5–12, find the probability.

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