ated 23-watt. Suppose that three of these bulbs are randomly sel (a) What is the probability that exactly two of the selected (b) What is the probability that all three of the bulbs have (c) What is the probability that one bulb of each type is se (d) If bulbs are selected one by one until a 23-watt bulb is at least 6 bulbs?
ated 23-watt. Suppose that three of these bulbs are randomly sel (a) What is the probability that exactly two of the selected (b) What is the probability that all three of the bulbs have (c) What is the probability that one bulb of each type is se (d) If bulbs are selected one by one until a 23-watt bulb is at least 6 bulbs?
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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please help me solving the question a) through d).
Transcribed Image Text:A box in a supply room contains 24 compact fluorescent lightbulbs, of which 8 are rated 13-watt, 9 are rated 18-watt, and 7 are
rated 23-watt. Suppose that three of these bulbs are randomly selected. (Round your answers to three decimal places.)
(a) What is the probability that exactly two of the selected bulbs are rated 23-watt?
(b) What is the probability that all three of the bulbs have the same rating?
(c) What is the probability that one bulb of each type is selected?
(d) If bulbs are selected one by one until a 23-watt bulb is obtained, what is the probability that it is necessary to examine
at least 6 bulbs?
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