SOLUTION: a calculator company donated 500 graphing calculators to a certain school. of the 500, 10 were defective. if a math class received 30 calculators, find the probability that exactly

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Question 668434: a calculator company donated 500 graphing calculators to a certain school. of the 500, 10 were defective. if a math class received 30 calculators, find the probability that exactly 30 graphing calculators were working properly (i.e. not defective)
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

of the 500 graphing calculators , 10 were defective. 490 non-defective

math class received 30 calculators

P(all non-def) = 490C30%2F%28500C30%29