**Unformatted text preview: **12. What is the probability of a score less than 70? 13. What is the probability of a score between 70 and 115? A group of 9 people take an IQ test. 14. What is the probability that their average is greater than 93? 15. What is the probability that their average is less than 97? 16. What is the probability that their average is between 90 and 107? 17. What is the probability that their average is 100? 18. Let A and B be events such that Pr[ A ] = .5 and Pr[ B ] = 0.7. What must ] Pr[ B A ∩ equal for A and B to be independent? 19. Let A and B be events such that Pr[ A ] = .6, Pr[ B ] = .4, and ] Pr[ B A ∪ = .8. Are A and B independent? 20. Toss two dice and add the faces. What is the probability of a number greater than 7, given that one die is at least 4? 21. Toss two dice and add them. Let A be an event of an even number and let B be an event of a number less than 6. What are the elements of the intersection?...

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- Fall '07
- MELutz
- Statistics, Normal Distribution, Probability, Macintosh, NORMAL PROBABILITY TABLE, 4.8%