00:01
So what we're looking at here is a binomial probability.
00:05
And for part a, b, c, and d, our n is going to be five, and our probability is one -fourth, so 0 .25.
00:13
So for part a, what is the probability that at least two are albino? so what we're going to do here is i'm going to use my calculator and do binomial cdf from a lower bound of 2 to an upper bound of 5 with a probability.
00:31
Of 25, point 25 and an n of 5.
00:35
So i'm going to put that into my calculator.
00:40
Binomial cdf, 5.
00:43
0 .25, and then from 2.
00:49
And it adds up all those outcomes for me.
00:51
So that's 0 .367188.
00:55
Part b, probability that at most, 1 is albino.
01:01
So i'm just going to change my lower and upper bound.
01:05
So my lower bound is now 0.
01:06
My upper bound is 1.
01:10
P is 0 .25 and n is 5.
01:16
So lower and upper bound are the only thing is really changing here.
01:20
Still the same fixed trials and everything...