00:01
So for this problem, the first thing that we're going to do is we need to know our actual equation that we're going to need.
00:10
So we're doing a standard deviation, and standard deviation can be denoted by this little funny guy, and we're doing the standard deviation of x because this subscript says that we're doing it for x.
00:25
So it is the square root of e.
00:35
In parentheses, you have x, and this is a capital x that matters minus mu squared.
00:43
And so you need to know mu first, because for this problem, we don't know what mu is.
00:52
And the way you find that is you do e to the x, e of x.
00:59
And so what that looks like for this problem is mu equals negative 2 times 0 .3 plus 3 times 2 plus 5 times 0 .4.
01:29
And so what this is is you're taking your x's and you're multiplying them by their function...