SOLUTION: The probability of finding exactly 4 0's in a line 40 digits long is about? The mean number of 0's in a line 40 digits long is?

Algebra ->  Probability-and-statistics -> SOLUTION: The probability of finding exactly 4 0's in a line 40 digits long is about? The mean number of 0's in a line 40 digits long is?      Log On


   

Question 432908: The probability of finding exactly 4 0's in a line 40 digits long is about?
The mean number of 0's in a line 40 digits long is?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
p = 0.10 and q = 0.90 in a binomial experiment.
40C4%2A%280.10%29%5E4%2A%280.90%29%5E36+=+0.205887, to 6 decimal places.
mu+=+np+=+40%2A0.10+=+4