00:03
This is a problem involving remand sums, and we have some graph that we're supposed to consider.
00:16
So let's say our graph looks like this, and this is 12, this is obviously zero, and we want to use six rectangles to find an estimate.
00:31
Well, first thing we need to do is determine our delta x.
00:36
Delta x is b minus a over n.
00:41
So in this case, we have b is 12 minus a is 0 over n is 6.
00:50
That tells us our delta x is equal to 2, which means that every two units is going to be a different rectangle.
01:02
So if we're doing, say, a left -handed sum, remand sum, then we would want something like this.
01:15
And we see that the left -hand remand sum would be an over -essum.
01:23
It's an overestimate because this is a concave down decreasing function...