00:01
All right, so if we look on a normal curve, a normal curve follows what's called the empiragro rule, which is the 6895 -99 .7 rule.
00:09
So that means within one serend deviation of the mean, we've got 68 % of the data.
00:13
So that's plus 1, sigma, and minus 1, right? so that's a z score of positive 1 and negative 1.
00:19
So each of these areas has 34 % in it, right? because it adds up to 68%.
00:25
That is our 0, right? if we got another standard deviation, then we know that that whole thing, right, this whole part should capture 95 % of the data.
00:36
So if we already have 68 % accounted for it, then the rest that's left in those two little tails should be 95 minus 68 divided by 2.
00:47
Right? so if i do that, 95 minus 68 is 27 and then divide by 2 is 13 .5.
01:00
So there's 13 .5 % in each of these parts right here between 1 and 2 serend deviations.
01:10
And then we know that 99 .7 % should be within three seren deviations, right? so you could find the little parts in there as well...