The range is the difference between the highest and lowest value:
Highest value: 85.63
Lowest value : 84.25
Range= 85.63-84.25 = 1.38
Standard deviation:
First, find the mean
Mean = sum of the values / number of values
M = (85.54+84.33+85.15+85.63+84.25+85.18+84.78+85.36+85.04) /9 = 85.03
For each value, subtract the mean and square the result:
85.54-85.03 = 0.51 = 0.51^2 = 0.26
84.33-85.03 = -0.7= 0.49
85.15-85.03 =0.12 = 0.014
85.63-85.03= 0.6 = 0.36
84.25-85.03=-0.78=0.61
85.18-85.03 = 0.15 = 0.02
84.78-85.03=-0.25=0.06
85.36-85.03=0.33 = 0.11
85.04-85.03=0.01 = 0.0001
Calculate the mean of the results ( add results and divide by 9)
1.9241/9=0.21
Square root of that value:
√0.21 = 0.46 (standard deviation)
