Answer nine and ten please

9. At a college the scores on the chemistry final exam are approximately normally distributed, with a mean of 75 and a standard deviation of 12. The scores on the calculus final are also approximately normally distributed, with a mean of 80 and a standard deviation of 8. A student scored 81 on the chemistry final and 84 on the calculus final. Relative to the students in each respective class, in which subject did this student do better? (A) The student did better in chemistry. (B) The student did better in calculus. C) The student did equally well in each course. (D) There is no basis for comparison, since the subjects are different from each other and are in different departments. (E) There is not enough information for comparison, because the number of students in each class is not known. 10. The amount of time required for each of 100 mice to navigate through a maze was recorded. The histogram below shows the distribution of times, in seconds, for the 100 mice. 60 70 80 90 100 110 120 Time (seconds) Which of the following values is closest to the standard deviation of the 100 times? AP Statistics Page 5 of 6 P CollegeBoard Test Booklet Mercy and Compassion Quiz (A) 2.5 seconds (B) 10 seconds (C) 20 seconds (D) 50 seconds (E) 90 seconds