00:01
Okay, we have here a normal distribution.
00:03
So that's the usual bell -shaped curve.
00:06
Here is the gpa on the x axis.
00:10
And here is the curve.
00:12
The mean is always in the middle.
00:15
So 2 .84 is the mean.
00:17
Standard deviation you are given is 0 .42.
00:21
I want to work out the chance a random student has a gpa of at least 2 .30.
00:28
So here is 2 .30 on the scale.
00:33
The key thing with a normal curve is the area underneath in total is always one.
00:40
So what you need to do is work out the area above 2 .30.
00:46
And that's your answer.
00:48
So this red area is the area i need.
00:51
That's at least 2 .30.
00:53
To find that, use the ti -84 plus, for example, and use the function called normal.
01:01
Cdf.
01:03
That you will find by pressing second followed by vars, on the right just below the arrow keys.
01:12
That brings up the menu for distributions.
01:15
Number two is normal cdf...