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Math

Probability

20,000 USD

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

Researchers surveyed recent graduates of two different universities about their annual incomes. The following two-way table displays data for the 300 graduates who responded to the survey:

Are the events “income is under 20,000 USD” and “attended University B” independent?

a.What is the probability that a randomly selected graduate earns under 20,000 USD?

b.What is the probability that a randomly selected graduate earns under 20,000 USD given they are from University B?

Are the events “income is 40,000 USD and over” and “attended University B” independent?

a.What is the probability that a randomly selected graduate earns 40,000 USD and over?

b.What is the probability that a randomly selected graduate earns 40,000 USD and over given they are from University B?

Annual
University A University B TOTAL
Income(USD)
Under 20,000
36
24
60
20,000 to
39,999
109
56
165
40,000 and over 35
40
75
1
ТОTAL
180
120
300

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