7. (8 points) A box has 10 marbles in it, 4 red and 6 white. Suppose we draw a marble from the box, do not replace it, a

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7 8 Points A Box Has 10 Marbles In It 4 Red And 6 White Suppose We Draw A Marble From The Box Do Not Replace It A 1 (27.62 KiB) Viewed 93 times

7. (8 points) A box has 10 marbles in it, 4 red and 6 white. Suppose we draw a marble from the box, do not replace it, and then draw another. Find the probability that at least one of the two marbles is white. 8. (10 points) The lifetime, measured in hours, of Smart-Life" light bulbs is normally distributed with mean 1000 hours and standard deviation 120 hours. a. Find the probability that a light bulb will burn out in more than 700 hours. b. What is 95th percentile of the lifetime of these bulbs (i.e, under what number of hours will 95% of the bulbs stop working)?