00:01
We are looking at iq scores.
00:03
They have a bell -shaped distribution with a mean, mu, of 100, a standard deviation sigma of 14.
00:12
We want to use the empirical rule.
00:15
So i'll start with demonstrating the empirical rule.
00:22
So this is symmetric.
00:25
And the empirical rule is also called the 68, 95, 99 .7 % rule.
00:34
It's all about the percentage of values within a certain number of standard deviations of the mean.
00:41
So, if i mark on one standard deviation above the mean and one below, approximately 68 % will be in this interval.
00:54
If i mark on two above the mean and two below, this interval is about 95%.
01:02
Three standard deviations above the mean, three below.
01:07
This interval contains about 99 .7%...