Q3: Five of the light bulbs in a box of nine bulbs are burnt out or otherwise defective. If wo bulbs are selected at random without replacement and tested. 1- If the first bulb is normal, what is the probability that the second bulb is defective? 2- If the first bulb is normal, what is the probability that the second bulb is also normal? 3- what is the probability that exactly one defective bulb is found?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Q3: Five of the light bulbs in a box of nine bulbs are burnt out or otherwise defective. If
two bulbs are selected at random without replacement and tested.
1- If the first bulb is normal, what is the probability that the second bulb is defective?
2- If the first bulb is normal, what is the probability that the second bulb is also normal?
3- what is the probability that exactly one defective bulb is found?
4- what is the probability that exactly two normal bulbs are found?
Transcribed Image Text:Q3: Five of the light bulbs in a box of nine bulbs are burnt out or otherwise defective. If two bulbs are selected at random without replacement and tested. 1- If the first bulb is normal, what is the probability that the second bulb is defective? 2- If the first bulb is normal, what is the probability that the second bulb is also normal? 3- what is the probability that exactly one defective bulb is found? 4- what is the probability that exactly two normal bulbs are found?
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From the provided information,

Total bulbs = 9

From which five bulbs are burnt out or otherwise defective.

Normal bulbs = 9 - 5 = 4

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