Question 1157660: 78% of all commuters take the train into the city. If 12 works are selected at random what is the probability that less than 7 commute by train
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! tedious to do by hand because need to compute several probabilities
on calculator it is binomcdf (12,.78,6) for <7, 6 is the highest value.
That probability is 0.0304
This can be checked by looking at the probability of 6, 5, 4.
for 6, it is 0.0236 (calc binompdf (12,.78,6)
for 5, it is 0.0057
for 4 it is 0.0010
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