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the following information. A mail-order computer business has three telephone lines. Let X denote the number of lines in use at a specified time. Suppose the probability mass function of X is as given in the following table. 0.100.15-020 X 0 f(x) .10 2 3 1 .15 .20 ? 11. What is the probability that at least two lines are in use? (A) 0.55 (B) 0.90 (C) 0.75 12. How many lines do you expect to be in use? (A) 3 (B) 2.5 (C) 1.5 (D) 0.35 2 (E) 0.25 (E) 2.2

the following information. A mail-order computer business has three telephone lines. Let X denote the number of lines in use at a specified time. Suppose the probability mass function of X is as given in the following table. 0.100.15-020 X 0 f(x) .10 2 3 1 .15 .20 ? 11. What is the probability that at least two lines are in use? (A) 0.55 (B) 0.90 (C) 0.75 12. How many lines do you expect to be in use? (A) 3 (B) 2.5 (C) 1.5 (D) 0.35 2 (E) 0.25 (E) 2.2

Calculus For The Life Sciences
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.3: Special Probability Density Functions
Problem 39E
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Question 11 and 12
11 an 12 based on the following information. A mail-order computer business has three telephone lines. Let X denote the number of lines in use at a specified time. Suppose the probability mass function of X is as given in the following table. 0.10+0.15-0·20 X 23 0 1 f(x) .10 .15 .20 ? 11. What is the probability that at least two lines are in use? (A) 0.55 (B) 0.90 (C) 0.75 12. How many lines do you expect to be in use? (A) 3 (B) 2.5 (C) 1.5 (D) 0.35 (D) 2 (E) 0.25 (E) 2.2
Transcribed Image Text:11 an 12 based on the following information. A mail-order computer business has three telephone lines. Let X denote the number of lines in use at a specified time. Suppose the probability mass function of X is as given in the following table. 0.10+0.15-0·20 X 23 0 1 f(x) .10 .15 .20 ? 11. What is the probability that at least two lines are in use? (A) 0.55 (B) 0.90 (C) 0.75 12. How many lines do you expect to be in use? (A) 3 (B) 2.5 (C) 1.5 (D) 0.35 (D) 2 (E) 0.25 (E) 2.2
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