00:01
What we have here is a poisson distribution where we have our mean of 6 .3, and our poisson distribution is equal to the following formula.
00:13
We have our exponential to the negative lambda times lambda to the x power over x factorial.
00:24
So we'll be using this equation in one way or another for the next three parts, where we're told the probability that a cookie has less than five parts, the probability that a cookie has five parts, and a probability that a cookie has five or more parts.
00:52
This less than five parts is the same as saying the probability of x being less than or equal to four, because we can't include five in our probability.
01:05
So this is equal to the probability of x equals zero plus the probability of x equals one plus the probability of dot dot dot until we get the probability of x equals four.
01:27
So this is the same as saying the sum from x equals 0 to 4 of our plazaon distribution, e to the negative 6 .3 times 6 .3 to the x over x factorial.
01:52
In which, for example, for x equals 0, we'll plug in 0 where our x is and we'll get the answer for x equals 0...