Each of 12 laptops was returned to the dealer due to a strange sound from the fan when they were running. Suppose 7 of these laptops have a faulty device and the other five have less serious problems. If tested at random, let X be the number in the first six test takers who have a faulty device. The P (X <= 4), is: a) 0.121 b) 0.879 c) 0.114 d) 0.125

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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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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Each of 12 laptops was returned to the dealer due to a strange sound from the fan when they were running. Suppose 7 of these laptops have a faulty device and the other five have less serious problems. If tested at random, let X be the number in the first six test takers who have a faulty device. The P (X <= 4), is:

a) 0.121

b) 0.879

c) 0.114

d) 0.125

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