How to use range to calculate standard deviation?

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.