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 this question we're going to discuss about the normal distribution.
00:11
Let me remind you that it will have the x followed by the normal with the mean and standard deviation.
00:18
It will turn the x minus mean over standard deviation.
00:22
It will follow by the standard normal.
00:24
Also if we think the x x bar will minus the mean of a standard deviation.
00:29
Also we need to divide by square of n in order to obtain the standard normal.
00:34
In this question here we have the length x followed by the normal, when the mean equal to the 234 .3, standard division equal to the 2 .2.
00:48
And the question asks, and also we have the n equal to the 28 root.
00:53
The question asks, let you find the probability that the sample mean x -par will be less, than the 234 .4.
01:03
Now to find this probability, we need to turn the x -par into the z.
01:09
To do that, we apply the formula here.
01:13
So we have to turn the 234...