A market has both an express checkout line and a super express checkout line. Let X1 denote the number of customers in line at the express checkout at a particular time of day, and let X2 denote the number of customers in line at the super express checkout at the same time. Suppose the joint probability distribution of X1 and X2 is as given in the accompanying table. X2 1 2 0.08 0.07 0.04 0.00 1 0.06 0.15 0.05 0.04 X1 0.05 0.04 0.10 0.06 3 0.00 0.03 0.04 0.07 0.00 0.01 0.05 0.06 What is the probability that the total number of customers in the two lines is exactly four? O 11% O 17% O 15% O 4%
A market has both an express checkout line and a super express checkout line. Let X1 denote the number of customers in line at the express checkout at a particular time of day, and let X2 denote the number of customers in line at the super express checkout at the same time. Suppose the joint probability distribution of X1 and X2 is as given in the accompanying table. X2 1 2 0.08 0.07 0.04 0.00 1 0.06 0.15 0.05 0.04 X1 0.05 0.04 0.10 0.06 3 0.00 0.03 0.04 0.07 0.00 0.01 0.05 0.06 What is the probability that the total number of customers in the two lines is exactly four? O 11% O 17% O 15% O 4%
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 11ECP: A manufacturer has determined that a machine averages one faulty unit for every 500 it produces....
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Transcribed Image Text:A 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 day, and
let X2 denote the number of customers in line at the super express checkout at the same time. Suppose the joint probability distribution of X1 and X2 is as given in the accompanying
table,
X2
1
2
0.08
0.07
0.04
0.00
1
0.06
0.15
0.05
0.04
X1
0.05
0.04
0.10
0.06
3
0.00
0.03
0.04
0.07
4
0.00
0.01
0.05
0.06
What is the probability that the total number of customers in the two lines is exactly four?
O 11%
O 17%
O 15%
O 4%
|000|
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