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 here, when you discuss about the normal distribution, let me remind you that if the x that followed by the normal, with the mean and standard deviation, and if we turn the x minus the mean over standard deviation, we obtain the standard normal.
00:21
In this question here, we're given the waiting time x if it will follow by the normal, with the mean equal to the 10 minute and the standard deviation equal to the 10 minutes, 2.
00:31
And the question is going to find the probability that the watching time x will be between the 10 to the 14 minutes.
00:40
To find this probability, we need to convert the x into the z.
00:45
And to do it, we need to apply the formula.
00:48
So we will have to take the 10 minus the mean over the standard division.
00:54
Same thing for the 14 minus the mean of standard deviation.
00:58
Then we get equal to the z.
01:00
It will be between the 0 and the 2...