passwella.
Menu

WAEC Mathematics 1994 Question 47

Question 47

Measures of Central Tendency

The mean heights of the three groups of students consisting of 20, 16 and 14 students are 1.67m, 1.50m and 1.40m respectively. Find the mean height of all the students.

  1. A.1.52m
  2. B.1.53m
  3. C.1.54m
  4. D.1.55m
  5. E.1.56m
Show the answer and explanation

Answer: C (1.54m)

Explanation

Total height = 20 × 1.67 + 16 × 1.50 + 14 × 1.40 = 77 m for 50 students, so the mean = 77 ÷ 50 = 1.54 m.