Civil Service Exam Reviewer · Data Interpretation · hard

Distribution of Mock Civil Service Exam Scores

Study the histogram below. It shows the scores of 200 examinees in a mock Civil Service Exam, grouped into score classes. Use it to answer the questions that follow.

Using the class midpoints (62, 67, 72, …, 92), what is the estimated mean score?

  1. 77
  2. 75.75
  3. 76.25
  4. 74.5

Answer

B. 75.75

Solution

Σ(f × midpoint) = 12(62) + 28(67) + 46(72) + 54(77) + 38(82) + 16(87) + 6(92) = 15,150. Mean = 15,150 ÷ 200 = 75.75.

More Data Interpretation questions

  1. What percent of the examinees scored from 70 to 84?
  2. How many examinees scored BELOW 70?
  3. How many examinees scored 80 or higher?
  4. Which score class has the MOST examinees?
  5. Among the reviewees who studied AT LEAST 6 hours, what percent scored 85 or higher?
  6. From Ana to Hazel, what is the average increase in score for each additional hour of study?
  7. What is the average exam score of the eight reviewees?
  8. Which reviewee studied MORE hours than the reviewee before him or her but got a LOWER score?
  9. Which reviewee got the HIGHEST exam score?
  10. By how much did total tourist spending in Q4 exceed that in Q1?

All Data Interpretation questions