00:01
We have been given a table of probabilities.
00:04
So we have been given x and p of x.
00:17
There we go.
00:18
And the probabilities we've been given, 0 .0016, 1 .172, 0774, 01935, 0 .2, 01935, 0 .2903, 0 .2613, 0.
00:45
306, 0280.
00:46
Okay, we want to use these to find some probabilities.
00:50
Part a, probability x is equal to 4.
00:55
So for this one, we just have to read it off here.
00:58
Here it is, 0 .2903.
01:03
Part b, the probability x is less than 3.
01:09
So which possible outcomes meet that criteria? less than three.
01:15
Well, it could be 0, 1 or 2, any of these.
01:20
If we add up these three probabilities, we will get the answer.
01:24
So let's do that.
01:30
So just adding these up, i get 0 .962.
01:40
But see, x is greater than 5.
01:46
So x could be 6 or it could be 7.
01:49
And i add these two probabilities up, 0 .1586...