Customers in a Bank A bank has a drive-through service.

Chapter 5, Problem 8RE

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QUESTION:

Problem 8RE

Customers in a Bank A bank has a drive-through service. The number of customers arriving during a 15-minute period is distributed as shown Find the mean, variance, and standard deviation for the distribution. (5−2)

Number of customersX

0

1

2

3

4

ProbabilityP(X)

0.12

0.20

0.31

0.25

0.12

Questions & Answers

QUESTION:

Problem 8RE

Customers in a Bank A bank has a drive-through service. The number of customers arriving during a 15-minute period is distributed as shown Find the mean, variance, and standard deviation for the distribution. (5−2)

Number of customersX

0

1

2

3

4

ProbabilityP(X)

0.12

0.20

0.31

0.25

0.12

ANSWER:

Solution

Step 1 of 2

We have to find the Mean, Variance and Standard deviation of the given distribution

The given distribution is

No.of customers(X)

0

1

2

3

4

Probability P(X)

0.012

0.2

0.31

0.25

0.12

Mean=

         =

         =0(0.012)+1(0.2)+2(0.31)+3(0.25)+4(0.12)

         =2.05


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