# B what is the probability of two suicides in one week

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b. What is the probability of two suicides in one week? EXERCISE 9 Suppose that three identical fair coins are thrown simultaneously. What is the probability that the 10 th trial is the 9 th time that all three show the same face? EXERCISE 10 Let X b ( n, p ). Find the third moment, that is E ( X 3 ). Hint: Start with E [ X ( X - 1)( X - 2)] and use the same trick we used in class for the binomial distribution. EXERCISE 11 Suppose a fair die is rolled 20 times. What is the probability that 1 appears five times, 2 and 3 four times each, 4 and 5 three times each, and 6 once? EXERCISE 12 An urn contains 200 marbles of which 150 are green and 50 are blue. Five marbles are selected without replacement from this urn. Let X be the number of green marbles among the five selected. a. Use SOCR to construct the exact distribution of X . Submit a printout. a. Use SOCR to construct the approximate distribution of X . Submit a printout.
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