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31.Refer to Exhibit 5-4. The expected number of machine breakdowns

Question : 31.Refer to Exhibit 5-4. The expected number of machine breakdowns : 1329669

 

 

31.Refer to Exhibit 5-4. The expected number of machine breakdowns per month is

a.2

b.1.70

c.one

d.None of the alternative answers is correct.

 

 

 

32.Refer to Exhibit 5-4. The probability of at least 3 breakdowns in a month is

a.0.5

b.0.10

c.0.30

d.None of the alternative answers is correct.

 

 

 

33.Refer to Exhibit 5-4. The probability of no breakdowns in a month is

a.0.88

b.0.00

c.0.50

d.None of the alternative answers is correct.

 

 

 

Exhibit 5-5

AMR is a computer-consulting firm. The number of new clients that they have obtained each month has ranged from 0 to 6. The number of new clients has the probability distribution that is shown below.

 

Number of

     New ClientsProbability

00.05

10.10

20.15

30.35

40.20

50.10

60.05

 

 

34.Refer to Exhibit 5-5. The expected number of new clients per month is

a.6

b.0

c.3.05

d.21

 

 

 

35.Refer to Exhibit 5-5. The variance is

a.1.431

b.2.0475

c.3.05

d.21

 

 

 

36.Refer to Exhibit 5-5. The standard deviation is

a.1.431

b.2.047

c.3.05

d.21

 

 

 

37.The number of electrical outages in a city varies from day to day. Assume that the number of electrical outages (x) in the city has the following probability distribution.

 

     xf(x)

00.80

10.15

20.04

30.01

 

The mean and the standard deviation for the number of electrical outages (respectively) are

a.2.6 and 5.77

b.0.26 and 0.577

c.3 and 0.01

d.0 and 0.8

 

 

 

Exhibit 5-6

Probability Distribution

 

     xf(x)

10.2

20.3

30.4

40.1

 

 

38.Refer to Exhibit 5-6. The expected value of x equals

a.24

b.25

c.30

d.100

 

 

 

39.Refer to Exhibit 5-6. The variance of x equals

a.9.165

b.84

c.85

d.93.33

 

 

 

Exhibit 5-7

A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information.

 

     Cups of CoffeeFrequency

0700

1900

2600

3300

2,500

 

 

40.Refer to Exhibit 5-7. The expected number of cups of coffee is

a.1

b.1.2

c.1.5

d.1.7

 

 

 

 

Solution
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