A box in a certain supply room contains seven 40-W lightbulbs, six 60-W bulbs, and five 75-W bulbs. Suppose that three bulbs are randomly selected. (Round your answers to four decimal places.) (a) What is the probability that exactly two of the selected bulbs are rated 75-W? 0.4038 x (b) What is the probability that all three of the selected bulbs have the same rating? 0.1099 x (c) What is the probability that one bulb of each type is selected? 0.2308 x (d) Suppose now that bulbs are to be selected one by one until a 75-W bulb is found. What is the probability that it is necessary to examine at least six bulbs? 0.0105 x Need Help? Read It

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