3 statstics quetions, homework help

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3 statstics quetions, homework help

8. A limousine has eight tires on it. A fleet of such limos was fit with a batch of tires that mistakenly passed quality testing. The following table lists the probability distribution of the number of defective tires on this fleet of limos where xx represents the number of defective tires on a limo and P(x) is the corresponding probability.

x

0

1

2

3

4

5

6

7

8

P(x)

.0454

.1723

.2838

.2669

.1569

.0585

.0139

.0015

.0008

Calculate the mean and standard deviation of this probability distribution. Give a brief interpretation of the values of the mean and standard deviation.

9. Let xx be a discrete random variable that possesses a binomial distribution. Using the binomial formula, find the following probabilities.

  1. p(5) for n=8 and p=.70
  2. p(3) for n=4 and p=.40

10. Let x be a discrete random variable that possesses a binomial distribution.

  1. What is the mean (round to three decimal places)
  2. What is the standard deviation of the probability distribution (round to three decimal places)?