00:01
For this problem, we are asked to find the value of the sample standard deviation.
00:05
Now i emphasize sample here, because that is something different than a population standard deviation.
00:11
To find a sample standard deviation, we take the square root of the sum, of each value in the sample minus the sample mean squared, divided by the sample size minus 1.
00:26
I'll note that if we already know the variance, we can find the sample standard deviation just by taking the square.
00:31
Root of the sample variance.
00:35
So in this case, we'll first need to find our sample mean, which we find just by taking the sum of each value divided by the number of values.
00:44
In our case here, the sum of each value would be 7 plus 7.
00:50
Sorry, fighting with my computer, 7 plus 7, minus 4, minus 4, minus 9, plus 7...