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 normal distribution.
00:11
Let me remind you that if the x that followed by the normal, with the mean and standard deviation, and if we take the x minus the mean divided by the standard deviation, we'll turn the standard normal.
00:27
Also, if we discuss about the humble mean x bar, it will minus the mean of a standard deviation.
00:33
We need to divide by square of n extra to get the standard normal.
00:38
In this question here we have the x followed by the normal, when the mean it will equal to the 2 39 and the standard division equal to 2 .1 and the standard division equals to the 52 .3.
00:54
Now in the question i asked you find the probability that one single x will be smaller than the 228 .3.
01:04
Now to find this probability, we need to convert the x into the z.
01:08
And to do it, we apply the formula for one single x...