00:01
For this problem, we are asked to compute the mean of the following sample values, 1 .3, 7 .0, 3 .6, 4 .1, and 5 .0.
00:08
So, to begin, we have that the mean of a sample, x bar, will be equal to the sum of the values divided by the number of values.
00:19
First, finding the sum of the values, we'll find that that would be 1 .3 plus 7 plus 3 .6 plus 4 .1 plus 5, which equals 21.
00:29
Then we divide by the number of data points there, which is 5.
00:34
So we have 21 over 5, which equals 4 .2.
00:38
Then for part b, we're asked to show that the sum of the difference between each data point and the mean is equal to 0.
00:45
So we'll go through and calculate those out...