It is known that 4% of the light bulbs manufactured by a factory are defective. Find the probability that, out of a sample of 300 light bulbs, less than 5% of the light bulbs are defective.

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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It is known that 4% of the light bulbs manufactured by a factory are defective.
Find the probability that, out of a sample of 300 light bulbs, less than 5% of the
light bulbs are defective.
Transcribed Image Text:It is known that 4% of the light bulbs manufactured by a factory are defective. Find the probability that, out of a sample of 300 light bulbs, less than 5% of the light bulbs are defective.
number uf
let x =, defective light bulb
:004
9:0.96
n: 300
hp= 12 >5
Since np >5, ng>5
Normmal Appneximation
to Bnomial distribu tiom
is used
X~N(12, 288.04)
P(x <15) = P( è< 14.5)
P(<14.5)
14.5-12
= P(2 <
=P(2< 0.1473)
=1- P(2> 01473)
- /-04404
F 0.ら596
Transcribed Image Text:number uf let x =, defective light bulb :004 9:0.96 n: 300 hp= 12 >5 Since np >5, ng>5 Normmal Appneximation to Bnomial distribu tiom is used X~N(12, 288.04) P(x <15) = P( è< 14.5) P(<14.5) 14.5-12 = P(2 < =P(2< 0.1473) =1- P(2> 01473) - /-04404 F 0.ら596
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