Chapter 4: Q.3 (page 282)
Short Answer
The necessary probability is .
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Chapter 4: Q.3 (page 282)
The necessary probability is .
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Find the expected value from the expected value table.

On average, how many batches should the baker make?
Use the following information to answer the next four exercises: Ellen has music practice three days a week. She practices
for all of the three days of the time, two days of the time, one day of the time, and no days of the time. One
week is selected at random.
The chance of an IRS audit for a tax return with over in income is about per year. Suppose that people
with tax returns over are randomly picked. We are interested in the number of people audited in one year. Use a
Poisson distribution to anwer the following questions.
a. In words, define the random variable
b. List the values that may take on.
c. Give the distribution of
d. How many are expected to be audited?
e. Find the probability that no one was audited.
f. Find the probability that at least three were audited.
Construct a probability distribution table for the data.
An emergency room at a particular hospital gets an average of five patients per hour. A doctor wants to know the probability that the ER gets more than five patients per hour. Give the reason why this would be a Poisson distribution.
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