Question 1047106
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Hi  
Recommend Using stattrek.com to check Your results
until You are familiar with Using Your Calculator.

1) One could also Use A Casio fx-115 ES plus 0r fx-991 ES plus. 
In a similar fashion..: Mode: DIST(binomial PD).

2) TI syntax for P(x-value) is binompdf(n, p, x-value).
P = .40, N = 20

1 p(X = 3) =  binompdf(20,.40,3) = .0123 0R 1.23%
2 P(X = 0) =  binompdf(20,.40,0) = .00004
Please use this as an opportunity to CHECK against YOUR work.