
Probability Distrabution
Find the probability of getting at least three defective items in a batch of ten items if the overall percentage of defects is 40%.
Ok, so this is my question "at least 3" so i am using my TI84 plus clac. and i make a table by using binompdf(n,p) and putting it in list 1.
It gives me this
0.00605
1.04031
2.12093
3.21499
4.25082
5.20066
6.11148
7.04247
8.01062
9.000157
101E4
so if i want to know the probablity of at least 3 what do i do with these numbers?

p(at least 3) = p(3) + p(4) + p(5) + ...  Jut add them up.
Of course, it is often easier to think about what you don't want.
p(at least 3) = 1  p(less than 3) = 1  (p(0) + p(1) + p(2))
