Question 1052596
P(DROP OUT) = .20, N = 6
A. P(x <= 2) = binomcdf(6,.20,2)
B. P(x = 3) = binompdf(6, .20, 3)
C. P(x = 0) = 1 - binompdf(6,.20,0)
D. P(x = 6) = 1 -  binompdf(6,.20,6)
E.
mean = np = 6*.20 = 1.2
s = sqrt(np(1-p) = sqrt(1.2* .8)

Note: We can use the normal distribution 
as a close approximation to the binomial distribution 
whenever np &#8805; 5 and nq &#8805; 5.
np = 1.2 < 5
use the binompdf function