Standard deviation is a measure of how spread out numbers are in a data set from the mean. It is calculated by taking the difference of each value from the mean, squaring the differences, summing them, and dividing by the number of values minus one, then taking the square root. The higher the standard deviation, the more varied the data.

2. Standard Deviation is a number that describes how much data vary or spread out. Uses difference of each data value from the mean. The higher the number the more the data is spread out.

3. 1. Find the mean, 2. Find the difference of each data value from the mean 3. Square each difference 4. Sum all the squared values

4. 5. Divide the sum by the number of data values minus one, ( n – 1) This value is called the variance, 6. Finally take the square root to find the standard deviation

5. {6, 8, 9, 8, 7, 5, 6, 7, 6, 8} 6 8 9 8 7 5 6 7 6 8 -1 1 2 1 0 -2 -1 0 -1 1 1 1 4 1 0 4 1 0 1 1

6. Or just do it on your calculator!!!