eChegg Study Guided ment ten. Chapt/X ex www.webassign.net/web/Student/Assignmen

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eChegg Study Guided ment ten. Chapt/X ex www.webassign.net/web/Student/Assignment-Responseslastdep 1748184406 BBaruchmail hColiege CUNYFirstLoginportallog. in BBCTC. Baruch Colle B Newman Lbrary B Baruch Calendars -1 points DevoreStat9 5 E.023 A certain market has both an express checkout line and a super-express checkout line. Let X, denote the number of customers in line at the express checkout at a particular time of number of customers in line at the superexpress checkout at the same time. Suppose the Joint pmif of x, and X is as given in the accompanying table. 0.04 0.05 0.10 0.04 0.00 0.05 0.06 0.07 0.06 0.08 0.07 0.08 0.11 0.04 0.03 0.01 0.00 0.00 of customers in line at the express checkout and the number in line at the superexpress checkout is , -X, Calculate the expected difference. The difference between the Need Help?sntr umtAnw Save Progress Pracice Another Version of two parts. For a randomly selected student, let x - the number of points eamed on the first part and y- the number of points earned on the sec an instructor has given a short quiz Suppose that the joint ped of X and Y is gliven in the accompanying table

Explanation / Answer

from above below is joint probability distirbtution:

marginal distribution of x1:

hence E(x1)=1.57

marginal distribution of x2:

E(X2)= 1.58

expected difference between x1 and x2 =E(X1)-E(x2) =1.57-1.58 = -0.01

x2 x1 0 1 2 3 Total 0 0.0800 0.0800 0.0400 0.0000 0.2000 1 0.0700 0.1100 0.0500 0.0600 0.2900 2 0.0500 0.0400 0.1000 0.0600 0.2500 3 0.0000 0.0300 0.0400 0.0700 0.1400 3 0.0000 0.0100 0.0500 0.0600 0.1200 Total 0.2000 0.2700 0.2800 0.2500 1.0000

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