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# Probability distribution

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1. A Motor Company has purchased steel parts from a supplier for several years and has found that 10% of the parts must be returned because they are defective. An order of 25 parts is received. What are the mean and standard deviation of the defective parts?
A) Mean = 3.5; standard deviation = 2.5
B) Mean = 2.5; standard deviation = 1.5
C) Mean = 1.5; standard deviation = 2.5
D) Mean = 2.5; standard deviation = 3.5

2. A Gulf Coast travel park has the following accommodations:
Facilities
Beach Front 17 24 41
Non Beach 6 210 216
Total 23 234 257

What is the probability of selecting a beach front site? (Points: 2)
A) 0.1725
B) 0.3465
C) 0.1595
D) 0.2245

3. The listed occupations of stockholders of a regional electric utility company included 9 percent who were homemakers. If six of these stockholders are randomly selected, what is the probability that:

No stockholders are homemakers?
A) 0.5679
B) 0.3600
C) 0.5400
D) 0.7956

4.Given a binomial random variable with n = 15 and = 0.4, find the following probability using the binomial table. P (6 < x < 10)
A) 0.0338
B) 0.1181
C) 0.0947
D) 0.3564