Questions 18 Calculate the standard deviation of grades for Accounting 101 Quiz. Note: You must do the calculation of the standard deviation as we did in class. Round final answer to the nearest tenth (1dp). All work must be hand-done. Use your answer from question 12 when you find the standard deviation. NOTICE THE FIRST ROW HAS BEEN DONE FOR YOU. X (X - x-bar) (X - x-bar) f (X - x-bar)? * f 20 20 - 63.0 = - 43.0 (-43.0) = 1849 2 3698.00 50 60 70 80 90 Totals Show work in the space below for your standard deviation calculation