00:01
Hello, welcome to this lesson.
00:02
In this lesson, we have exams called x, the number of drinks that was sticking pro to the exams, and that is x1.
00:11
We've been asked to find the standard deviation for the number of drinks.
00:17
So this is what we'll do.
00:18
Let's see the formula for the standard deviation.
00:22
So this one, we have the formula, the standard deviation as the square root.
00:33
Of the summation of all the x1 values minus the mean the mean value squared all over n minus 1 so this means that we need to find the value of the mean of these values so let's go on we can find the mean by summing the values from b to to b to be 11 after that we need to have the number five times that we have sum.
01:15
So with this, we do the count b2 to b11.
01:21
Right.
01:23
And we are having the mean of 2 .7.
01:26
We can create x1 minus a mean such we have in here.
01:35
And now this becomes all the b value.
01:41
So b2 minus the mean.
01:44
The mean is 2 .7...