F. The number of customers waiting for gift-wrap service at a department store is an rv $X$ with possible values 0,1,2 , 3,4 and corresponding probabilities $.1, .2, .3, .25, .15 . \mathrm{A}$ randomly selected customer will have $1,2,$ or 3 packages for wrapping with probabilities $.6, .3,$ and $.1,$ respectively. Let $Y=$ the total number of packages to be wrapped for the customers waiting in line (assume that the number of packages submitted by one customer is independent of the number submitted by any other customer).a. Determine $P(X=3, Y=3),$ i.e., $p(3,3)$b. Determine $p(4,11)$

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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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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F. The number of customers waiting for gift-wrap service at a department store is an rv $X$ with possible values 0,1,2 , 3,4 and corresponding probabilities $.1, .2, .3, .25, .15 . \mathrm{A}$ randomly selected customer will have $1,2,$ or 3 packages for wrapping with probabilities $.6, .3,$ and $.1,$ respectively. Let $Y=$ the total number of packages to be wrapped for the customers waiting in line (assume that the number of packages submitted by one customer is independent of the number submitted by any other customer).
a. Determine $P(X=3, Y=3),$ i.e., $p(3,3)$
b. Determine $p(4,11)$

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