00:01
We're looking at a normal distribution with a mean of 69 and a standard deviation of 2 .4.
00:07
We want to know the probability of it being between 62 and 73.
00:13
So let's get our z -score for 62 and 73, which is going to be 62 minus 69 over 2 .4, and 73 minus 69 over 2 .4.
00:25
So let's see what that's going to be.
00:28
The first one is going to be negative 2 .92, and then this is going to be 1 .67.
00:38
So now that's our z -score, needs to be between these two numbers.
00:42
I'm going to go to my z -formula and get 1 .67 just because that's where i am.
00:49
That's going to be 0 .95254.
00:54
And then let me go to my negatives and get 2 .92.
00:57
And that's going to be 0 .175, 0 .00175.
01:03
I subtract those and i'll have my answer.
01:06
So that's going to be 7, 0, and then that's going to be 5, 9...