0.39, -Compute the pmf of Y.

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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in Wednesday's
P(Thurs.) = 0.39,
mail. In actuality,
Friday, or
A library subscribes to two different weekly news magazines, each of which is supposed to arrive
each one may arrive on Wednesday, Thursday,
Saturday. Suppose the two arrive independently of one another, and for each one P(Wed.) = 0.29,
P(Fri.) = 0.19, and P(Sat.) = 0.13. Let Y= the number of days beyond
Wednesday that it takes for both magazines to arrive (so possible Y values are 0, 1, 2, or 3). Compute the pmf of Y. [Hint: There are 16 possible outcomes; Y(W,W) = 0, Y(F,Th) = 2, and so on.]
(Enter your answers to four decimal places.)
0
P(Y)
3
Transcribed Image Text:in Wednesday's P(Thurs.) = 0.39, mail. In actuality, Friday, or A library subscribes to two different weekly news magazines, each of which is supposed to arrive each one may arrive on Wednesday, Thursday, Saturday. Suppose the two arrive independently of one another, and for each one P(Wed.) = 0.29, P(Fri.) = 0.19, and P(Sat.) = 0.13. Let Y= the number of days beyond Wednesday that it takes for both magazines to arrive (so possible Y values are 0, 1, 2, or 3). Compute the pmf of Y. [Hint: There are 16 possible outcomes; Y(W,W) = 0, Y(F,Th) = 2, and so on.] (Enter your answers to four decimal places.) 0 P(Y) 3
Expert Solution
Step 1: We first define the event and corresponding probability

Let's the events be,

W minus W e d n e s d a y
T minus T h u r s d a y space
F minus F r i d a y space space
S minus S a t u r d a y

The corresponding probabilities are,

P left parenthesis W right parenthesis equals 0.29
P left parenthesis T right parenthesis equals 0.39
P left parenthesis F right parenthesis equals 0.19
P left parenthesis S right parenthesis equals 0.13

Let Y be the number of days beyond Wednesday that it takes for both magazines to arrive (so possible Y values are 0, 1, 2, or 3)

The possible number of outcomes are 4 squared equals 16

left parenthesis W comma W right parenthesis comma left parenthesis W comma T right parenthesis comma left parenthesis W comma F right parenthesis comma left parenthesis W comma S right parenthesis
left parenthesis T comma W right parenthesis comma left parenthesis T comma T right parenthesis comma left parenthesis T comma F right parenthesis comma left parenthesis T comma S right parenthesis
left parenthesis F comma W right parenthesis comma left parenthesis F comma T right parenthesis comma left parenthesis F comma F right parenthesis comma left parenthesis F comma S right parenthesis
left parenthesis S comma W right parenthesis comma left parenthesis S comma T right parenthesis comma left parenthesis S comma F right parenthesis comma left parenthesis S comma S right parenthesis

the value associated for each of the outcomes follows:

Y left parenthesis W comma W right parenthesis equals 0 comma space space space space space Y left parenthesis W comma T right parenthesis equals 1 comma space space space space space space space Y left parenthesis W comma F right parenthesis equals 2 comma space space space space Y left parenthesis W comma S right parenthesis equals 3
Y left parenthesis T comma W right parenthesis equals 1 comma space space space space space space Y left parenthesis T comma T right parenthesis equals 1 comma space space space space space space space space Y left parenthesis T comma F right parenthesis equals 2 comma space space space space space space Y left parenthesis T comma S right parenthesis equals 3
Y left parenthesis F comma W right parenthesis equals 2 comma space space space space space space Y left parenthesis F comma T right parenthesis equals 2 comma space space space space space space space space Y left parenthesis F comma F right parenthesis equals 2 comma space space space space space space Y left parenthesis F comma S right parenthesis equals 3
Y left parenthesis S comma W right parenthesis equals 3 comma space space space space space Y left parenthesis S comma T right parenthesis equals 3 comma space space space space space space space space Y left parenthesis S comma F right parenthesis equals 3 comma space space space space space space space Y left parenthesis S comma S right parenthesis equals 3


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