Betty's final exam scores (X) from four courses and each course's final exam statistics ( and ) are listed as below. Based on her final scores, in which subject has Betty done best? Betty's X = 82 on the Math course final exam with = 85 and = 5 Betty's X = 62 on the English course final exam with = 60 and = 2 Betty's X = 131 on the Psychology course final exam with = 137 and = 3 Betty's X = 46 on the Biology course final exam with = 34 and = 8