00:01
So in this question we need to find each one of the probabilities.
00:03
And to do that, we are going to use the z table.
00:06
The z table provides the area, or the same as the probability in the psternonoribucia means more than a z here.
00:16
So it is always showing the left area.
00:19
So in item a, if you are interested in the probability that we are going to have value between 087 and 128, using the table, we have the z table.
00:32
This will be first, what is this probability, which is the one with the highest value, minus the probability of z be smaller than 0 .87, which is the smallest one.
00:46
So for both of them, we have the left side, so it is the left area, which will give us using the z table, two values.
00:53
089 -97 for this one, and 080 -78 for the other value.
01:01
Now, computing the subtraction, we are going to get the answer for this question is 0 .0 .0919...