00:01
So in this problem, you're going to let x represent the amount of weight lost, and the mean amount or the average amount is 4 pounds, and the standard deviation is 2 pounds, and we know that it is normally distributed.
00:33
So therefore, you can draw that bell -shaped curve, and we could put the average in the center.
00:41
So part a is asking you what is the distribution equation? so we're going to say that x is approximately normal with a mean of four and a standard deviation of two.
00:57
In part b, anne lost 10 pounds in a month.
01:05
So that means you're going to be up here at 10 pounds.
01:11
That's what she lost.
01:12
So x would be 10.
01:18
And we want to know what the z score is for that.
01:22
So to calculate a z score, we use the formula x minus mu over sigma.
01:29
So x was 10, average was 4, and the standard deviation was 2...