The formula for that is:
Range = maximum - minimum
Standard Deviation = Maximum - Minimum/ 4
For example: Bob scores this week were 85, 88, 92, 95, 99. To calculate the standard deviation using range I will need the minimum (lowest) score and the maximum (highest) score.
Minimum = 85
Maximum = 99
99-85 = 14
Then divide by 4: 14/4 = 3.5
The standard deviation is 3.5.
