00:01
Okay, we have here then a normal distribution.
00:03
So it looks like this.
00:06
Here we have diameter of the ball bearings, normal curve.
00:14
The mean in the middle, as always.
00:17
So here is four centimeters.
00:22
And i want to work out the proportion less than 3 .7.
00:28
So here then is 3 .7.
00:32
The area in total is 1.
00:34
So if i find this area here, i have the answer.
00:40
Shaded area equals.
00:47
And to find that, use a calculator for the normal, sorry, the ci -84 plus is the best one to use...