Variables whose values are determined by chance are called...

Question

# Variables whose values are determined by chance are called...

1. Variables whose values are determined by chance are called ____________ variables.
2. The ____________ of a random variable is the long-run average of its values.
3. 35 % of the applications for a particular job are rejected by the prospective employer. What is the probability that among 10 applicants, at least 4 will be rejected ?
4. According to a survey, 79 % of tourists prefer group tours. What is the probability that in a randomly selected sample of 18 tourists, 7 or less will NOT prefer group tours ?
5. When a particular machine is functioning, 80 % of the items produced are non-defective. If 3 items are examined, what is the probability that one is defective ?
6. 20 % of the applications for a particular job are rejected by the prospective employer. What is the probability that among the next 14 applicants less than 3 will be rejected ?
7. Which of the following is NOT a requirement for a Binomial Probability Distribution ?
8. Only 5 % of students in a class get an A in the Final Exam. If 10 students are randomly picked from that class, what is the probability that at most 2 of them will get an A in the Final Exam ?
9. Shoppers enter a mall at a rate of 120 per hour. What is the probability that at least 25 shoppers will enter the mall in a 10 minute period ?
10. In the Poisson Distribution Formula, μ represents ____________.
11. A car painting company has determined that the painting time of cars is uniformly distributed between  25 and  105 minutes. What is the probability that it will take between  40 and  65 minutes for that company to paint a car ?
12. The driving time for an individual from his home to his office is uniformly distributed between  20 minutes and  1 hour. Compute the probability that this individual takes more than half an hour to drive from home to office.

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