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Ch. 3 - Probability
Larson - Elementary Statistics: Picturing the World 8th Edition
Larson8th EditionElementary Statistics: Picturing the WorldISBN: 9780137493470Not the one you use?Change textbook
Chapter 3, Problem 3.2.23b

"Using the Multiplication Rule In Exercises 19-32, use the Multiplication Rule.
23. Celebrities as Role Models In a sample of 1103 probable voters, three out of four say they would like entertainers to address social and political issues. Two probable voters are selected at random. (Source: The Hollywood Reporter)
b. Find the probability that neither probable voter would like entertainers to address social and political issues."

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Step 1: Understand the problem. We are tasked with finding the probability that neither of the two randomly selected probable voters would like entertainers to address social and political issues. This involves using the Multiplication Rule for independent events.
Step 2: Identify the probability of a single voter not wanting entertainers to address social and political issues. From the problem, three out of four voters (or 75%) would like entertainers to address these issues. Therefore, the probability of a voter not wanting entertainers to address these issues is 1 - 0.75 = 0.25.
Step 3: Recognize that the two voters are selected independently. This means the probability of both events occurring (neither voter wanting entertainers to address social and political issues) can be calculated by multiplying the probabilities of the individual events.
Step 4: Apply the Multiplication Rule. The probability of neither voter wanting entertainers to address social and political issues is given by: 0.252. This represents the product of the probabilities for each voter.
Step 5: Simplify the expression. The result of 0.252 will give the final probability. You can calculate this value to find the numerical result.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Multiplication Rule

The Multiplication Rule in probability states that the probability of two independent events both occurring is the product of their individual probabilities. This rule is essential when calculating the likelihood of multiple outcomes happening together, especially in scenarios involving random selections.
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Multiplication Rule: Dependent Events

Independent Events

Independent events are those whose outcomes do not affect each other. In the context of this question, the selection of one probable voter does not influence the selection of another. Understanding independence is crucial for applying the Multiplication Rule correctly.
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Probability of Multiple Independent Events

Complementary Probability

Complementary probability refers to the likelihood of an event not occurring. In this case, if three out of four voters support entertainers addressing issues, the probability that a voter does not support this is one minus that probability. This concept is vital for calculating the probability that neither of the two selected voters supports the idea.
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Complementary Events
Related Practice
Textbook Question

"Using the Multiplication Rule In Exercises 19-32, use the Multiplication Rule.

24. Knowing a Person Who Was Murdered In a sample of 11,771 children ages 2 to 17, 8% have lost a friend or relative to murder. Four children are selected at random. (Adapted from University of New Hampshire)

b. Find the probability that none of the four has lost a friend or relative to murder."

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Textbook Question

Using the Multiplication Rule In Exercises 19-32, use the Multiplication Rule.

30. Standardized Test Scores According to a survey, 57.8% of college-seeking high school seniors say they have taken one of the standardized tests for potential college students. Of these, 35.6% say they do not plan to submit their score with their college applications. (Adapted from Niche)

b. Find the probability that a randomly selected college-seeking high school senior took one of the standardized tests and plans to submit this score with their college

applications.

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Textbook Question

Using the Multiplication Rule In Exercises 19-32, use the Multiplication Rule.

28. Blood Types The probability that a Latinx American person in the United States has type A+ blood is 29%. Four Latinx American people in the United States are selected at random. (Source: American National Red Cross)

b. Find the probability that none of the four have type A+ blood.

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Textbook Question

Finding Conditional Probabilities In Exercises 7 and 8, use the table to find each conditional probability.

8. Retirement Savings The table shows the results of a survey in which 250 male and 250 female workers ages 25 to 64 were asked if they contribute to a retirement savings plan at

work.

b. Find the probability that a randomly selected worker is female, given that the worker contributes to a retirement savings plan at work.

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Textbook Question

Officers The offices of president, vice president, secretary, and treasurer for an environmental club will be filled from a pool of 14 candidates. Six of the candidates are members of the debate team.

b. What is the probability that none of the offices are filled by members of the debate team?

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Textbook Question

22. Brexit A survey asked 1115 British adults how Britain's decision to leave the European Union has impacted the country. The results are shown in the Pareto chart. Find the

probability of each event. (Adapted from Ipsos)

b. Randomly selecting a British adult who feels that the move has had a very negative impact on Great Britain

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