Question: Lewis earned 85 on his biology midterm and 81 on his history midterm. In the biology class the mean score was 79 with a standard deviation of 5. In the history class the mean score was 76 with a standard deviation of 3.  Edit

Answer: Z-score = (score - mean) / Standard Deviation z-score of Biology = (85 - 79) / 5 = 1.2 z-score of History = (81 - 76) / 3 = 1.67 He did better in History as the z-score of history is more than z-score of biology.  Edit