Compute (a)  ?(? = 1), (b) ?(? ≥ 4), and (c) ?(1 ≤ ? ≤ 3).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 31E
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2. Each of 12 refrigerators of a certain type has been returned to a distributor because of the presence of 
a high-pitched oscillating noise when the refrigerator is running. Suppose that four of these 12 have 
defective compressors and the other eight have less serious problems. If they are examined in random 
order, let ? be the number among the first six examined that have a defective compressor. Compute (a) 
?(? = 1), (b) ?(? ≥ 4), and (c) ?(1 ≤ ? ≤ 3). 

2. Each of 12 refrigerators of a certain type has been returned to a distributor because of the presence of
a high-pitched oscillating noise when the refrigerator is running. Suppose that four of these 12 have
defective compressors and the other eight have less serious problems. If they are examined in random
order, let X be the number among the first six examined that have a defective compressor. Compute (a)
P(X = 1), (b) P(X ≥ 4), and (c) P(1 ≤ X ≤ 3).
Transcribed Image Text:2. Each of 12 refrigerators of a certain type has been returned to a distributor because of the presence of a high-pitched oscillating noise when the refrigerator is running. Suppose that four of these 12 have defective compressors and the other eight have less serious problems. If they are examined in random order, let X be the number among the first six examined that have a defective compressor. Compute (a) P(X = 1), (b) P(X ≥ 4), and (c) P(1 ≤ X ≤ 3).
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