Two balls are chosen randomly from an urn containing 8 white, 4 black, and 2 orange balls. Suppose that we win $2 for each black ball selected and we lose $1 for each white ball selected (orange is neutral). Let X denote our winnings. (a) What values can X take? Ans: {−2, −1, 0, 1, 2, 4} (b) Find the pmf for X

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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Two balls are chosen randomly from an urn containing 8 white, 4 black,
and 2 orange balls. Suppose that we win $2 for each black ball selected
and we lose $1 for each white ball selected (orange is neutral). Let X
denote our winnings.
(a) What values can X take? Ans: {−2, −1, 0, 1, 2, 4}
(b) Find the pmf for X
Hint: there are 14 C 2
 ways to choose two balls. This value can be
the denominator of all the probabilities, the numerator being the num-
ber of ways to choose two balls of specific color(s). Also, remember the
probabilities should add up to 1, you can use this to check your work.

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