00:01
There is given a normal distribution for this question.
00:03
First of all, let me take notes what's given here.
00:05
The mean score is given here, which is denoted by mu.
00:08
That was given as 100.
00:10
And the standard deviation was also given here.
00:12
So the standard deviation denoted by sigma, and that was given here is 15.
00:17
Since we have a normal distribution, i can define the random variable x, which is normally distributed.
00:22
So this is 115 here.
00:25
So what do we have to get, we have to get the probability of random variable x, which is between 110 and 120.
00:34
To get this probability, i'm going to use the graphing display calculator here.
00:39
So i'm going to use the normal cdf function.
00:43
So the lower boundary is 110, the upper boundary is 120...