00:01
So for part a, we're looking for the probability that z is less than 1 .53.
00:06
Now, i have two z distribution tables.
00:09
You can see the one on the left is cumulative to the left of positive z scores.
00:14
So, looking for 1 .53, we find the 1 .5 row here.
00:19
Scroll across until we get to the 0 .03 column.
00:22
So we can see our result is 0 .9370.
00:27
Oops, that's not what i wanted to do.
00:28
So that's 0 .9370.
00:32
Or round, okay, yeah, we're asked to round to four decimal places, so yeah, that's what we want, 0 .9370.
00:38
For part b, the probability that z is greater than 1 .84, because of the symmetry of the normal distribution, that's the same as the probability that z is less than negative 1 .84...