00:01
The way i read this is that it's a true, it's a multiple choice question where we want to know which one is true, where it's normally distributed that i'm going to call it nd with a mean of 42 and a standard deviation of 7.
00:16
Well, the false ones, i can say a is false.
00:22
It is impossible that the distribution contains a data value greater than 70.
00:28
That's not true.
00:29
Normal distributions are continuous and go on indefinitely.
00:32
So we could.
00:33
It just would be a really small probability.
00:37
I can say d is false.
00:40
The z score of negative 1 .5 will have a value greater than the mean because z scores are how far we are away from the mean.
00:48
So if it's negative, we're below the mean, so it won't be greater than the mean.
00:53
And c, approximately 95 % of the data will lie within 35 and 39.
01:02
Well, 35 to 42 is 7 and 42 to 49 is 7, which is within one standard deviation of the mean...