Mean scores of class A = 1200÷14 = 85.7 -----------------------------------------------------------------------------------------------------
Sum of scores of class B = 60 + 60 + 70 + 71 + 73 + 73 + 75 + 76 + 77 + 84 + 85 + 86 + 91 + 92 = 1073
Number of scores of class B = 14 Mean scores of class B = 1073÷14 = 76.6 ----------------------------------------------------------------------------------------------------- Class A has the highest mean score