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Mean, Variance and Standard Deviation Probability Distribution Statistics Assignment Help

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1. Calculate the mean, variance and standard deviation of the following of the following probability distribution.

X P(x)

2 .30

7 .20

8 .25

10 .25

2. A telemarketer makes 6 phone calls per hour and is able to make a sale on 30% of these contacts. During the next

hour, find:

a. The probability of making exactly 4 sales.

b. The probability of making less than 2 sales.

c. Calculate the mean and standard deviation for the probability distribution.

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