Chapter 4: Q. 91 (page 293)
What is the probability that the San Jose Sharks win at least five games in that upcoming month
Short Answer
b.
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Chapter 4: Q. 91 (page 293)
What is the probability that the San Jose Sharks win at least five games in that upcoming month
b.
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The chance of an IRS audit for a tax return with over $25,000 in income is about 2% per year. We are interested in the expected number of audits a person with that income has in a 20-year period. Assume each year is independent.
a. In words, define the random variable X.
b. List the values that X may take on.
c. Give the distribution of X. X ~ _____(_____,_____)
d. How many audits are expected in a 20-year period?
e. Find the probability that a person is not audited at all.
f. Find the probability that a person is audited more than twice
A hospital researcher is interested in the number of times the average post-op patient will ring the nurse during a 12-hour shift. For a random sample of 50 patients, the following information was obtained. Let X = the number of times a patient rings the nurse during a 12-hour shift. For this exercise, x = 0, 1, 2, 3, 4, 5. P(x) = the probability that X takes on value x. Why is this a discrete probability distribution function (two reasons)?
You need to find a store that carries a special printer ink. You know that of the stores that carry printer ink, 10% of them carry the special ink. You randomly call each store until one has the ink you need. What are p and q?
Use the following information to answer the next six exercises: On average, a clothing store gets customers per day.
Assume the event occurs independently in any given day. Define the random variable .
On average, how long would you expect a new hire to stay with the company?
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