"[2 (f x2)]-[Z(f '96)]: 7. Use the formula 5 = to find standard deviation of the data n(n 1) summarized in the frequency distribution table below: Tar (mg) in Non- Frequency x(midpz') filtered Cigarettes f 2529 0 TOTAL 2 f - x [Hint: Complete the table and use the values from the table to evaluate the formula 5; 2 S = n[2(f-i'vz)]-[Z(fx)]2 = 3' n(n1) b. Also, find the mean. x= (()f . x) / Ef) c. Find the Coefficient of Variation