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samqu3 - 10 7 SHOW YOUR WORK(4 pts(b If n = 20 aspirin...

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STA 2023 Fall 1997 SAMPLE QUIZ 3 Name: SSN: INSTRUCTIONS : Show all of your work when you answer a question. Place a box around your final answer. 1. According to USA Today 40% of the people who take aspirin take it to prevent heart disease. Suppose we survey n aspirin takers and let x = the number of those surveyed who take aspirin to prevent heart disease. (a) If n = 5 people who take aspirin are surveyed: (i) What is E ( x )? SHOW YOUR WORK! (2 pts) (ii) What is the standard deviation, σ of x ? SHOW YOUR WORK! (2 pts) (iii) What is the probability that exactly 2 indicate that they take aspirin to prevent heart disease? (Your answer may contain quantities like . 6 2 but should not contain any “facto- rials” or an unevaluated term like
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Unformatted text preview: ( 10 7 ) .) SHOW YOUR WORK! (4 pts) (b) If n = 20 aspirin users are surveyed, what is the probability that “more than 11” in our sample take aspirin to prevent heart disease? SHOW YOUR WORK! (4 pts) 1 2. The weekly sales totals at a small restaurant has a probability distribution that is approximately normally distributed with mean $16,000 and standard deviation $1,000. The owner wants to pay a bonus to the manager if the weekly sales exceed some amount. If the owner only wants to pay the bonus about 8% of the time, what dollar amount should the owner select for the weekly sales total? SHOW YOUR WORK! (8 pts) 2...
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