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Occurs without replacement

Suppose that a company has six plants, which are designated as plant 1, plant 2, ..., plant 6.

a. If sampling occurs without replacement, how many samples of size 3 can be chosen from those plants?

b. List all the possible samples of size 3.

c. What is the probability that plant 2 is included in the sample?

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## Q : Scores on an economics examination

The scores on an economics examination are normally distributed with a mean of 74 and a standard deviation of 16. If the instructor assigns a grade of A to 10% of the class, what is the lowest score a student may have and still obtain an A?