An employee earned $128,500 working for an employer in the current year. The current rate for FICA Social Security is 6.2% payable on earnings up to $118,500 maximum per year and the rate for FICA Medicare 1.45% of all earnings. The employer's total FICA payroll tax for this employee is: $9,210.25 $9,830.25 $879.75 $8,950.50 The prices, on a particular day, of 53 stocks on the Toronto Stock Exchange are summarised in the table below Price (CDN) 75 - 95 96 - 100 101 - 105 106 - 110 111 - 120 121 - 135 Number of stocks 6 10 12 13 7 5 Calculate the standard deviation of stock prices, to two decimal places [8]