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? X (b) What is the probability that all three of the selected bulbs have the same rating? x (c) What is the probability that one bulb of each type is selected? 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? Enter a number. Need Help? Read It
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? X (b) What is the probability that all three of the selected bulbs have the same rating? x (c) What is the probability that one bulb of each type is selected? 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? Enter a number. Need Help? Read It
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.8: Probabilities Of Disjoint And Overlapping Events
Problem 2C
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