Question 932081
p(hit) = .70
 Using a TI calculator 0r similarly a Casio fx-115 ES plus
.....
n = 5, P(x = 3)= 3C5(.70^3)(.30)^2  0r binompdf(5, .70, 3)= .3087  0r 30.87%
....
n = 20, P(x=15)= 20C15(.70^15)(.30)^5  0r  binompdf(20, .70, 15)= .1789
.....
n = 6
P(x ≥ 5) = 1 - P(x ≤ 4) = 1 - binomcdf(6,.70,4) = 1- .5798 = .4212
P(x ≤ 4) = binomcdf(6,.70,4)= .5798