Question 9.6

9.6 Increasing test scores. The average score on an exam in organic chemistry was 60. The professor gave a retest and reported that the average score on the exam increased by 25%. This means that the average score on the retest was

  1. (a) 45%.

  2. (b) 75%.

  3. (c) 85%.

  4. (d) It is impossible to know without having all of the scores from the retest.