00:01
Ok, we are told here the amount of cereal follows a normal distribution, in other words, the usual bell -shaped curve.
00:10
Here's the weight along the x -axis.
00:13
It looks like this.
00:16
The mean, we're told, is 16 .18.
00:19
That goes here in the middle.
00:21
We have symmetry about that mean, and we're told standard deviation is 0 .25.
00:29
Now, the key thing about a normal curve is the area underneath here is always going to be 1.
00:36
So i want to work out the chance that the box is underfilled, which means contains less than 16 ounces.
00:46
So here is 16, which means all i do is work out the area below 16.
00:55
And to find that, use a calculator with a ti -84 plus, and the function you need is called normalcdf...