Question 23
Measures of Central TendencyIn a school there are 35 students in Class 2A and 40 in Class 2B. The mean score for Class 2A in an English Literature examination is 60.0 and that for 2B in the same paper is 52.5. Find, to one place of decimal, the mean for the combined classes.
- A.1.5
- B.56.0
- C.56.2
- D.56.3
- E.56.5.
Show the answer and explanation
Answer: B (56.0)
Explanation
Total marks = 35 × 60 + 40 × 52.5 = 2100 + 2100 = 4200 for 75 students, so the mean is 4200 ÷ 75 = 56.0.