00:01
All right, in your question, you're working with the empirical rule and you're asked to find some certain percentages based on the direction or location you are within that normal distribution.
00:11
Let's first address the empirical rule.
00:14
The empirical rule says that we have a mean center.
00:17
Technically, it's zero.
00:19
And then we go one standard deviation to the right or one standard deviation to the left, and that gap is 68%.
00:27
If we go two standard deviations below and above, the gap is now 95%.
00:34
And finally, three standard deviations above and below gives us 99 .7.
00:41
Part a, you're asked to find the percentage to the right of the mean.
00:45
Well, the right of the mean, the mean is right at the center, so the percentage that's to the right of that is just 50%...