00:01
For this problem, we are given a discrete probability distribution, but we need to read what's given to us carefully.
00:07
So we have x, x can be 1, 2, 3, or 4.
00:13
Then we have not the individual probabilities.
00:17
Instead, we have the cumulative probabilities, probability of x less than or equal to little x, where those cumulative probabilities are 0 .33, 0 .44, 0 .72 .2 .72.
00:35
And 1 .00.
00:38
We're asked for the probability that x is greater than or equal to 2.
00:48
We can find that alternatively by taking 1 minus the probability of x strictly less than 2.
00:58
Since x is discrete, that is then the same thing as 1 minus probability of x less than or equal to 1.
01:08
And looking at our table, we can see probability of x less than or equal to 1 is 0 .33...