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Category > Management Posted 03 Nov 2017 My Price 7.00

Busy Tellers

The Standard Deviation of a Discrete Random Variable

Busy Tellers Recall Example 5.20, where X denotes the number of tellers busy with customers at 1:00 P.M. Find the standard deviation of X.

Example 5.20 The Mean of a Discrete Random Variable

Busy Tellers Prescott National Bank has six tellers available to serve customers. The number of tellers busy with customers at, say, 1:00 P.M. varies from day to day and depends on chance; hence it is a random variable, say, X. Past records indicate that the probability distribution of X is as shown in the first two columns of Table 5.15. Find the mean of the random variable X.

TABLE 5.15

Table for computing the mean of the random variable X, the number of tellers busy with customers

x

P(X = x)

xP(X = x)

0

0.029

0.000

1

0.049

0.049

2

0.078

0.156

3

0.155

0.465

4

0.212

0.848

5

0.262

1.310

6

0.215

1.290

 

 

4.118

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Maurice Tutor
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Status NEW Posted 03 Nov 2017 10:11 PM My Price 7.00

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