00:01
In this table, we have the probability distribution for a discrete random variable x, and we consider the cumulative distribution function.
00:10
That's capital f of x, which is equal to the probability that x is at most some given value.
00:19
For the first question, we were asked to find the cdf at minus 2.
00:25
So this is the probability that x is anything less than are equal to minus 2.
00:31
And if we inspect the distribution, we look for all possible values of x that are minus 2 or less.
00:39
There's only 1 and that's minus 2.
00:43
So this probability is 1 over 6.
00:51
For the second question we want the cdf at x equals minus 1.
01:00
This is the probability of x being anything less than or equal to minus 1.
01:05
So looking at the probability distribution, the values of x that are minus 1 or less are minus 2 and minus 1...