Problem 5. A professor tries to count the number of students attending lecture. For each student in the audience, the professor either counts the student properly (with probability p) or overlooks (and does not count) the student with probability 1-p. The exact number of attending students is 70. (a) The number of students counted by the professor is a random variable N. What is the PMF of N? (b) Let U = 70 – N denote the number of uncounted students. What is the PMF of N? (c) What is the probability that the undercount U is 2 or more? (d) For what value of p does E[U] = 2?
Problem 5. A professor tries to count the number of students attending lecture. For each student in the audience, the professor either counts the student properly (with probability p) or overlooks (and does not count) the student with probability 1-p. The exact number of attending students is 70. (a) The number of students counted by the professor is a random variable N. What is the PMF of N? (b) Let U = 70 – N denote the number of uncounted students. What is the PMF of N? (c) What is the probability that the undercount U is 2 or more? (d) For what value of p does E[U] = 2?
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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