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
