SOLUTION: a box contains 24 transistors, 4 of which are defective if 4 are sold at random . find the following probabilities a)exactly 2 are not defective b)all are not defective c)none is d

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Question 1175389: a box contains 24 transistors, 4 of which are defective if 4 are sold at random . find the following probabilities a)exactly 2 are not defective b)all are not defective c)none is defective d)almost 1 is defective.
Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
.
a box contains 24 transistors, 4 of which are defective if 4 are sold at random .
find the following probabilities
a) exactly 2 are not defective
b) all are not defective
c) none is defective
d) almost 1 is defective.

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(a)  P =  %28C%5B4%5D%5E2%2AC%5B20%5D%5E2%29%2FC%5B24%5D%5E4 =  = 0.107284.
              


             
(b)  P =   C%5B20%5D%5E4%2FC%5B24%5D%5E4 =  = 0.455957.
             


(c) is THE SAME as (b)



(d)  MAKES no SENSE.