A box of 20 flashbulbs contains 2 defective bulbs. A random sample of 2 is selected and tested. Let X be the random variable associated with the number of defective bulbs in the sample.

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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A box of
20
flashbulbs contains
2
defective
bulbs.
A random sample of 2 is selected and tested. Let X be the random variable associated with the number of defective bulbs in the sample.
 
​(A) Find the probability distribution of X.
​(B) Find the expected number of defective bulbs in the sample. 
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