00:01
For this problem, we are told to consider a binomial experiment with n equals 10 and p equals 0 .2.
00:06
So we have that our probability mass function, f of x, is going to be equal to n, so 10, choose x, times 0 .2 to the power of x, times 0 .8 to the power of 10 minus x.
00:23
So part c is the first one that we don't have yet.
00:27
We can find that by taking the sum, the sum, oh, that's not quite what i wanted, the thumb from i equals 0 up to 4 of ncr, that's our binomial coefficient function, 10 choose i, 0 .2 to the power of i, 10 .8, 10 minus i.
00:55
So we find that that is a probability of 0 .9672.
01:03
For probability x greater than or equal to 1, that is equal to 1 minus, the probability that x is equal to 0, basically...