00:01
Hi, i'm david and i'm here to help you answer your question.
00:03
Now let me bring up your question here.
00:06
In the question here, we are going to discuss about the sample link distribution of the sample mean.
00:11
Let me remind to you that the sample mean x bar will be approximately to the normal with the mean of the x bar equal to the meaning of the population.
00:23
The standard of the x bar equal to the sigma the 1 if we have the n quater equal to the and because it follows by the normal, everything the xbile will minus the mean.
00:36
Our standard deviation will obtain the standard normal.
00:40
In the question here, we will have the sample size n equal to the 20, and we will have the mean it will equal to the 2000.
00:52
And we have 6x equal to the 100.
00:55
And the question is going to find the symbol mean that will cut up the above 95%.
01:01
It means that we want to find the probability that the x will be greater equal to some value a and then it will equal to the 95%.
01:15
And to find the volume that a will consider the common moment.
01:19
So it will be the probability the x small equal to the a and each equal to the 100%, this will be the x bar.
01:26
100 % minus 95%, which is equal to the 5%.
01:31
And to find that i'll convert the xxx into the z by applying this formula here...