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At a large company in Alberta, a box in a certain supply room contains 7 40-W lightbulbs, 3 60-W lightbulbs, and 6 75-W bulbs. Suppose that 3 bulbs are randomly selected without replacement. (Round your answers to 4 decimal place needed.) (a) What is the probability that exactly two of the selected bulbs are rated 75-W? (b) What is the probability that all three of the selected bulbs have the same rating? (c) What is the probability that one bulb of each type is selected?

At a large company in Alberta, a box in a certain supply room contains 7 40-W lightbulbs, 3 60-W lightbulbs, and 6 75-W bulbs. Suppose that 3 bulbs are randomly selected without replacement. (Round your answers to 4 decimal place needed.) (a) What is the probability that exactly two of the selected bulbs are rated 75-W? (b) What is the probability that all three of the selected bulbs have the same rating? (c) What is the probability that one bulb of each type is selected?

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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At a large company in Alberta, a box in a certain supply room contains 7 40-W lightbulbs, 3 60-W lightbulbs, and 6 75-W bulbs. Suppose that 3 bulbs are randomly selected without replacement. (Round your answers to 4 decimal places, if needed.) (a) What is the probability that exactly two of the selected bulbs are rated 75-W? (b) What is the probability that all three of the selected bulbs have the same rating? (c) What is the probability that one bulb of each type is selected? (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 least six bulbs?
Transcribed Image Text:At a large company in Alberta, a box in a certain supply room contains 7 40-W lightbulbs, 3 60-W lightbulbs, and 6 75-W bulbs. Suppose that 3 bulbs are randomly selected without replacement. (Round your answers to 4 decimal places, if needed.) (a) What is the probability that exactly two of the selected bulbs are rated 75-W? (b) What is the probability that all three of the selected bulbs have the same rating? (c) What is the probability that one bulb of each type is selected? (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 least six bulbs?
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