SOLUTION: Question 972677: If 50 (FIFTY) classes of 20 (TWENTY) students are randomly selected, what is the probability that 10 (TEN) classes have no left-handed students?

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Question 980548: Question 972677: If 50 (FIFTY) classes of 20 (TWENTY) students are randomly
selected, what is the probability that 10 (TEN) classes have no left-handed
students?
Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!
Question 972677: If 50 (FIFTY) classes of 20 (TWENTY) students are randomly
selected, what is the probability that 10 (TEN) classes have no left-handed
students? 
I will assume that 10% of people are left-handed and 90% are right-handed.

The probability that a class of of 20 has no left handed students is

0.1215766546

I got that was a TI-84. Press 2ND VARS, scroll to select binompdf( with 20
trials, probability 0.1, x value 0,  binompdf(20,.1,0)

The probability that a group of 50 classes has exactly 10 classes with no left-
handed students is

0.0405810641

Press 2ND VARS (scroll to select binompdf(  this time with 50 trials,
probability 0.0405810641, x value 10,  binompdf(50,0.1215766546,10)

Edwin
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