# Statistics - Probability

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A mail order company tracks the number of returns it receives each day. Information for the last 50 days shows

Number of returns Number of days

0 - 99 6

100 - 199 20

200 - 299 15

300 or more 9

a. How many sample points are there?

b. List and assign probabilities to sample points.

c. What procedure was used to assign these probabilities?

There are two more assignments in a class before its end, and if you get an A on at least one of them, you will get an A for the semester. Your subjective assessment of your performance is

Event Probability

A on paper and A on exam .25

A on paper only .10

A on exam only .30

A on neither .35

a. What is the probability of getting an A on the paper?

b. What is the probability of getting an A on the exam?

c. What is the probability of getting an A in the course?

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(1) (a) There are 4 sample points

(b) P(0-99) = 6/50 = 0.12, P(100-199) = 20/50 = 0.4, P(200-299) = 15/50 = 0.3 ...

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