00:01
So in this question, it is given that there is a normal distribution here, and the average, the mean value is given as 20 .2, and the standard deviation, that is given as 1 .2 inches.
00:14
So let me just take notes.
00:16
So the mean, that is mu, that is equal to 20 .2, and the standard deviation, 1 .2.
00:23
So let's say, x is the random variable and normally distributed, that is 20 .2 and 1 .2.
00:30
Then the next step, we have to find the problem that a baby length between, so we have to find the x value, which is between 21 .3 and 19 .1.
00:45
We have to find a probability of this one.
00:47
Let me just draw a graph and easily see how we can just solve the question.
00:53
So there is the mu value.
00:55
So the mu value is 20 .2.
00:57
And the standard deviation, that is 1 .2.
01:00
So the x value here is, let's say, 19 .1, and the x value, the upper boundary is 21 .3.
01:10
So what we have to do, we have to just find the area of this shaded region.
01:16
So we can find this area by using the ti calculator here.
01:21
So the probability of x is between 21 .3 and 19 .1...