00:01
Hi, i'm david and i'm here to help you on to 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 normal distribution.
00:10
Let me remind you that if you have the x that follows by the normal, with the mean and the standard division, then the same mean x bar also followed by the normal.
00:20
In such a way that every time the x bar will minus the mean of a standard deviation divided with square of n, we have 10 the standard normal.
00:28
In the question here, the dirt x will follow by the standard.
00:30
By the normal when the mean equal to the 3 ,262, standard division equals to the 1100 and the same size n equals to the 16.
00:41
Once you find the probability that the mean x -y would be more than the 4 ,000.
00:48
And to find this probability, i need to convert the x into the z.
00:51
To do it, i need to apply this formula here...