00:01
For this problem, we need to find a sample standard deviation of this set of numbers.
00:06
And to find the sample standard deviation, first we need to find the average of these numbers.
00:12
So i'm going to add them.
00:18
And then i'm going to divide this sum by the total numbers that we have, which is a total of eight numbers.
00:27
And so this is going to equal 132 divided by 8.
00:33
Which is 16 .5.
00:37
Now this is my sample average.
00:41
X bar.
00:42
To find a sample standard deviation, let me first copy these eight numbers in a column to make things easier for me.
00:53
So 17, 16, 11, 21, 12, 10, 23, and 22.
01:02
So to find the sample standard deviation, first we're going to subtract the average of 16 .5 from each number.
01:15
So 17 minus 16 .5, that's 0 .5.
01:19
And then 16 minus 16 .5, that's negative 0 .5.
01:25
11 minus 16 .5.
01:28
That will be negative 5 .5.
01:30
And if i continue to subtract the average, i'm going to get the following differences.
01:40
4 .5, negative 4 .5, negative 6 .5, positive 6 .5, and positive 5 .5...