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MidtermFormB

# MidtermFormB - MIDTERM EXAM(Form B PSTAT 5E HSU Fully...

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MIDTERM EXAM (Form B) PSTAT 5E HSU 10/29/2010 Fully explain your answer. Answers with no explaination will not receive credit. GOOD LUCK!!! 1. (20%) A population consists of ten employment ﬁles, three of which are out of date. Two ﬁles are randomly selected for inspection. (a) (5%) What is the probability that both of the two sampled ﬁles will be out of date? (b) (5%) What is the probability that exactly one of the two sampled ﬁles will be out of date? (c) (5%) What is the probability that neither of the two sampled ﬁles will be out of date? (d) (5%) Let X be the number of ﬁles that are out of date in the sample of two ﬁles. Compute E( X ), the expected value of X . 2. (20%) A state park has two campgrounds. Suppose that the probability that there is still space in the ﬁrst campground at 5 pm is 0.5, the probability that there is still space in the second campground at 5 pm is 0.4, and the probability that there is still space in both campground at 5 pm is 0.2. What is the probability that a camper who shows up at precisely 5 pm will

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MidtermFormB - MIDTERM EXAM(Form B PSTAT 5E HSU Fully...

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