Quiz Review for Weeks 3 and 4

1. State whether the variable is discrete or continuous.

The # of keys on each student's key chain.

2. Decide whether the experiment is a binomial experiment. Explain why by citing the properties of binomial experiments.

Testing a pain reliever using 20 people to determine if it is effective. The random variable represents the number of people who find the pain reliever to be effective.

3. Use the binomial probability distribution to answer the following probability questions. According to government data, the probability that an adult under 35 was never married is 25%. In a random survey of 10 adults under 35, what is the probability that:

Exactly 5 were never married?

4. Use the binomial probability distribution to answer the following probability questions. According to government data, the probability that an adult under 35 was never married is 25%. In a random survey of 10 adults under 35, what is the probability that:

No more than two were never married?

5. True or False: Given the basic rules of Probability, P(A) can be equal to negative 0.18 or - 18%.

6. We have the random variable X = {3, 6} with P(3) = .15 and P(6) = .85. Find E(X).

7. Use the binomial probability distribution to answer the following probability questions. According to government data, the probability that an adult under 35 was never married is 25%. In a random survey of 10 adults under 35, what is the probability that:

Between 4 and 6 were never married (inclusive)?

8. Use the Poisson probability table in the back of your text to answer the following probability questions. Amazon.com receives an average of 5 sales per second through their Internet site. What is the probability that:

They will get exactly 8 sales during the next second?

9. We have a Poisson distribution with mean = 3. Find P(X = 2), P(X < 2), find P(X 2), the variance, and standard deviation.

10. How many ways can a committee of 7 be chosen from 20 people?