00:01
Hi, i'm david and i'm here, you answer the question.
00:03
Now let me bring up the question here.
00:05
In the question here, we are going to discuss about the normal distribution.
00:09
Now to answer this question, let me bring up the z table.
00:15
And i will put the table on the right here.
00:20
Let me make it bigger.
00:24
Now in the first question a, we need to find the 5 on the values 3.
00:33
It will equal to the 09830.
00:37
So find the c means that it will equal to the probe but pleasing the z small equal to the c equal to the 0 .9 -2 -3 -0 now it means that it will try to look at the graph from the standard normal we have the bell curve it will be the 0 so the c certainly must be on the right it will be the c we're looking for so start the area on the left here it will equal to the 0 .9083 then the area on the right is equal to the 1 minus 0 .9 and 3 .0 equal to the 017.
01:19
Look at the form of the table i bring here, it has the negative g score with the proper on the left tail.
01:25
Now it will look for the value of the 0 .017 inside the table.
01:31
0 .017.
01:32
It will be here, which is correspond to the g score on the minus 2 .1 .2.
01:37
It means that if we look at the minus 2 .12, the r on the left equal to the 0 .017, then the c must equal to the 2 .12 because of the symmetry.
01:49
Now for the answer, from the question a, the c equals to the 2 .12.
01:54
Similarly, for the question b, when you find the probability on the z between the 0 and the c, such that is equal to the 0 .3 -133.
02:06
It will try to draw the graph here.
02:09
We will have the bell curve.
02:13
This is going to be the 0 and this will be the c we're looking for.
02:17
So stand the area under the yellow one here.
02:20
It will equal to the 0 .3 -133...