Agroup of ten students were given a statistics quiz. their scores were: 20, 19, 22, 20, 15, 18, 15, 21, 19, 20. the variance of these scores is 5.43. what is the standard deviation?

The variance is given to be 5.43

Apply the square root to the variance to get the standard deviation

s = standard deviation

v = variance

s = sqrt(v)

s = sqrt(5.43)

s = 2.330326 which is approximate

s = 2.33

I rounded to 2 decimal places as this is the number of decimal places used for the variance.

D. -6.1 - (-3.13) = -2.97