00:01
Hi, i'm david and i'm here to have you on the question.
00:03
Let me pick up the question here.
00:06
In the question here, we are going to discuss about the normal dtv machine.
00:10
Let me remind you that if the x not followed by the normal window, when the meal and the standard deviation, it will turn the x reminds the meaning of the standard deviation.
00:22
It will gain the standard normal.
00:24
Well, it will turn the same moment if we minus the mean of the standard deviation.
00:29
We need to divide extra to create extra square the main.
00:31
In order to tell the standard normal.
00:34
In the equation here, the time for the code x, it will be followed by the normal, with the lee equal to the 150 seconds, standard division equals 045 seconds.
00:48
Now we have the inlayer helped you do with the curve of the 3 customers, so end equal to the 3.
00:54
And once you find the probability that the total 10 x1 plus x2 plus x3 will be last down the 9 minutes.
01:02
Notice that the 9 minutes, it will equal to the 9 times 16 and equal to the 5 in 40 seconds.
01:13
So what you have the sum on the x1, x2 will be smaller than the 540.
01:20
Now to find this probability i will divide everything by the n will be the 3.
01:27
And if we do it, the one on the left here turns out to be the x bar smaller than.
01:34
540, d1 .3 equal to the 180.
01:38
You'll find this probability on the x bar...