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.
00:09
In this question here, we're going to discuss about the normal distribution.
00:14
And let me remind you that if we have the x that followed by the normal, with the mean and the standard deviation, and if we think the x minus the mean of a standard deviation, we will obtain the standard normal.
00:27
If we turn the x bar minus mean of a standard deviation, then we need to give you to give divide by square of n in order to obtain the standard normal.
00:37
In this question here, we're given the mean length of the unemployment x, it will follow by the normal when the mean equal to the 21 and the standard division equal to the 3 .4.
01:00
And we have given the n equal to the 90.
01:03
Now for the question a, want to find the probability that for individual x will be greater than 21...