Using Microsoft Excel to computer Standard Deviation:

(Other spreadsheet programs should operate in a similar manner.)

Step 1:  Type in the list of data values for which you want to compute the standard deviation.  See the picture below:

Step 2:  In the cell directly beneath the last data value, type in the formula:
=stdev(C5:C11)  See the picture below:

NOTE:  C5 is the cell location of the first data value in the list, and C11 is the last data value in the list.  Naturally, depending on where you type your list of numbers (and how long the list is) you will have to change these cell locations accordingly.

Step 3:  After typing in the formula to compute standard deviation, hit the ENTER key.  The standard deviation for the list of numbers you have typed will automatically be computed.
In this example, the st. dev. is 6.3 (rounded).