00:01
Okay, we are told that the weights of the babies follow a normal distribution, normal curve, the val -shaped curve.
00:08
The mean is 7 .5, and the mean therefore goes in the middle here of my bell curve.
00:14
That's 7 .5.
00:16
And we're giving here pounds.
00:21
And we're told that the standard deviation is 0 .91.
00:27
So the mean, mu, 7 .5 pounds.
00:31
And deviation .91.
00:35
I want to work at the proportion of births between 5 .72.
00:41
So over here, 5 .72 and 8 .36.
00:52
So i want to work out basically this area underneath the normal curve.
00:57
The entire area is 1, so that we can find that fraction and get the answer.
01:02
And to find that area in red, so it's called a weight w...