Each line in Appendix Table A has 50 slots. On average, how many 7s do we expect to find in a given line?

Question

in the problem p = 0.1

Answer 1

X is Binomial ( p=0.1, n=50, k=7)

 

(50 choose 7) (0.1)^7 (0.9)^(50-7) =

 

(50 choose 7)(0.1)^7 (0.9)^43

 

50!/(7! 43!)(0.1)^7(0.9)^43

 

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