Question

The Denver Post reported that, on average, a large shopping center had an incident of shoplifting caught by security 1.4 times every three hours. The shopping center is open from 10 A.M. to 9 P.M. (11 hours). Let r be the number of shoplifting incidents caught by security in an 11-hour period during which the center is open.

(a) Explain why the Poisson probability distribution would be a
good choice for the random variable *r*.

-Frequency of shoplifting is a common occurrence. It is reasonable to assume the events are dependent.

-Frequency of shoplifting is a rare occurrence. It is reasonable to assume the events are dependent.

-Frequency of shoplifting is a common occurrence. It is reasonable to assume the events are independent.

-Frequency of shoplifting is a rare occurrence. It is reasonable to assume the events are independent.

What is λ? (Use 2 decimal places.)

(b) What is the probability that from 10 A.M. to 9 P.M. there will
be at least one shoplifting incident caught by security? (Use 4
decimal places.)

(c) What is the probability that from 10 A.M. to 9 P.M. there will
be at least three shoplifting incidents caught by security? (Use 4
decimal places.)

(d) What is the probability that from 10 A.M. to 9 P.M. there will
be no shoplifting incidents caught by security? (Use 4 decimal
places.)

Answer #1

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Giving a test to a group of students, the grades and gender are
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A
B
C
Total
Male
2
3
5
10
Female
16
9
8
33
Total
18
12
13
43
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1.The sample mean is an unbiased estimator for
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