00:01
So we have a probability distribution.
00:02
And x is the number of classes taken, and that goes from 1, 2, 3, 4, 5.
00:08
And the probability of taking that number of classes is 0 .14, 0 .129, 0 .12, and 0 .1.
00:20
And we want to find in part a, what is the probability that a student takes at least two classes? and at least two classes we're going to find by instead of adding all of these together, we're just going to go 1 minus 0 .14, and that's going to give us 0 .86.
00:40
Now on part b, we want to find the probability that a student takes at least three classes.
00:49
And so that's the sum of these three, adding these three together, and these two add up to 0 .22 plus 0 .35.
00:57
So that's going to add up to 0 .57.
01:02
Part c, we have what is the likelihood that a student takes more than three? more than three includes 4 and 5, and the sum of these two is 0 .45.
01:18
Letter d, we want to find the probability that the student takes fewer than, or less than two classes.
01:26
And less than two classes is just taking 1 is 0 .14.
01:31
Part e, we want to determine the probability of taking two or fewer.
01:43
And two or fewer is the sum of these two, and 0 .14 and 0 .29.
01:49
We're going to add up to a 3 and 0 .43.
01:54
Then finally, we want to determine in part f what the mean is, and g is the standard deviation...