00:01
So when i see a binomial, i need to know the number of terms which is 8.
00:06
I need to know the probability of success is 0 .3 and then the probability of failure is 0 .7 and they tell me it's binomial.
00:16
So this should be fine to do the probability that x is exactly 5.
00:22
So what we want to do is 8, that's the number of terms combination 5, and then what we want is to succeed 5 times, which means we need to fail 3 times.
00:35
Now if you're not used to that notation, it might, let me put a little arrow here, that might actually be the notation 8, 5 in a different class, but my calculator does it like that where you do the first number factorial, you subtract the two numbers factorial as well as the second number factorial.
00:53
And i kind of just want to see what the other numbers are like 0 .3 to the fifth times 0 .7 to the third.
01:02
Actually, let me just save that until till the end.
01:06
So let me simplify this real quick.
01:08
8 times 7 times 6 times, i'm going to stop at 5 factorial because i can cancel out the 5 factorial and 3 times 2 times 1 is actually equal to 6, so that would cancel out with that...