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Probability
(d) (between two and five lines, inclusive, are in use} 0.88 (e) {between two and four lines, inclusive, are not in use> 0.25 |x (f) {at least four lines are not in use} 0.10

(d) (between two and five lines, inclusive, are in use} 0.88 (e) {between two and four lines, inclusive, are not in use> 0.25 |x (f) {at least four lines are not in use} 0.10

A First Course in Probability (10th Edition)
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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A mail-order company 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 3 4 6 p(x) 0.11 0.15 0.20 0.25 0.19 0.09 0.01 Calculate the probability of each of the following events. (a) {at most three lines are in use} 0.71 (b) {fewer than three lines are in use} 0.46 (c) {at least three lines are in use} 0.54 (d) {between two and five lines, inclusive, are in use} 0.88 (e) {between two and four lines, inclusive, are not in use} 0.25 (f) {at least four lines are not in use} 0.10
Transcribed Image Text:A mail-order company 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 3 4 6 p(x) 0.11 0.15 0.20 0.25 0.19 0.09 0.01 Calculate the probability of each of the following events. (a) {at most three lines are in use} 0.71 (b) {fewer than three lines are in use} 0.46 (c) {at least three lines are in use} 0.54 (d) {between two and five lines, inclusive, are in use} 0.88 (e) {between two and four lines, inclusive, are not in use} 0.25 (f) {at least four lines are not in use} 0.10
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