2. A mail-order computer business has six telephone lines. Let X denote the number of lines in use at a specified time. Suppose the pmf of X is as given in the accompanying table. 1 2 4 5 f(x) 0.10 0.15 0.20 0.25 0.20 0.06 0.04 Calculate the probability of each of the following events. a. at most three lines are in use b. fewer than three lines are in use c. at least three lines are in use d. between two and five lines, inclusive, are in use e. between two and four lines, inclusive, are not in use f. at least four lines are not in use
2. A mail-order computer business has six telephone lines. Let X denote the number of lines in use at a specified time. Suppose the pmf of X is as given in the accompanying table. 1 2 4 5 f(x) 0.10 0.15 0.20 0.25 0.20 0.06 0.04 Calculate the probability of each of the following events. a. at most three lines are in use b. fewer than three lines are in use c. at least three lines are in use d. between two and five lines, inclusive, are in use e. between two and four lines, inclusive, are not in use f. at least four lines are not in use
Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter14: Counting And Probability
Section14.2: Probability
Problem 3E: The conditional probability of E given that F occurs is P(EF)=___________. So in rolling a die the...
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Transcribed Image Text:2. A mail-order computer business has six telephone lines. Let X denote the number of lines
in use at a specified time. Suppose the pmf of X is as given in the accompanying table.
1
3
4
5
6
f(x)
0.10
0.15
0.20
0.25
0.20
0.06
0.04
Calculate the probability of each of the following events.
a. at most three lines are in use
b. fewer than three lines are in use
c. at least three lines are in use
d. between two and five lines, inclusive, are in use
e. between two and four lines, inclusive, are not in use
f. at least four lines are not in use
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