Expand mobile version menu

Psychometrist

Real-Life Activities

Real-Life Math -- Solution

Use the following formula to figure out the standard deviation.

equation.gif

s = standard deviation
n = number of survey results (also called number of elements in a set)
sum.gif(x - xavg)2 = the sum of all the deviations from the mean squared

s = ?

n = 9

sum.gif(x - xavg)2 = 76.9

s =sqrt.gif(76.9 / 8)

s =sqrt.gif9.6125

s = 3.1

The standard deviation is 3.1.