Probability-two of the selected bulbs
A box contains four 40-W bulbs, five 60-W bulbs, and six 75-W bulbs. Suppose that three bulbs are randomly selected. What is the probability that exactly two of the selected bulbs are rated 75W?
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She randomly samples 67 CFOs and finds that 40 of them get their money news from newspapers. Does the test show enough evidence to reject the findings of Robert Half International? Use α = .05
the crack length [in micrometers (µm)] of a randomly selected crack is normally distributed with an average length of 71 and a variance of 6.25. (a) What percantage of cracks are over 74 µm long?
Three cards are randomly selected, without replacement, from a standard deck of 52 playing cards. Compute the conditional probability that the first card selected is a club given that the second and third cards are both clubs.
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