00:01
This problem, first of all, we have been asked to compute the mean of the given sample value.
00:06
So recall the formula for the sample mean.
00:08
This is given by summation x divided by n, where x represents the data values and n represents the sample size.
00:16
So we have summation x.
00:17
So in the numerator, we're going to add all of the sample values.
00:20
So we have 5 plus 9 plus 4 plus 10.
00:24
And in the denominator we write down the sample size.
00:27
We can see that there are four values in the sample, so this is what we get.
00:31
So we end up with 28 divided by 4, and this is equal to 7, and so the mean, the sample mean, will be 7.
00:40
And next we have been asked to show that summation x minus x bar is equal to 0.
00:46
So we need to add x minus x bar...