Answer
a. Range= 3216, Variance = 993826, Standard Deviation = 996.908
b. Coefficient of Variation = 231.947%
Work Step by Step
a. Range = Highest Value - Lowest Value = 3261-45 = 3216
Variance = $%σ^2=[∑(x-μ)^2 ]/n-1 $
=${∑(x^2) –[∑(x)^2/N]}/n-1%$
=$(157589-1847280)/9$
=$993826$
Standard Deviation = $\sqrt 993826 = 996.908$
b. Coefficient of Variation=$996.908\div429.8\times100% =231.95%$
