00:01
There is a normal distribution given in this question and the mean, let me just take notes, the mean is given as.
00:08
So we just denote the mean as the symbol mu, which is 50 ,000.
00:14
And the standard deviation, standard deviation, which is this notation, that is 20 ,000.
00:20
So let's say x is the random variable for this normal distribution, that is 50 ,000, comma, 20 ,000.
00:28
So what we have to do, we have to find the probability of x is less than 40 ,000.
00:38
Let me just graph this situation.
00:41
So this is the bell shape and the mean value here is which is 50 ,000.
00:48
So the 40 ,000 is over here.
00:52
So we have to get the area of this shaded region.
00:55
So the probability of x is less than 40 ,000.
00:58
We have to use the function of the calculator, which is the normal cdf...