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Question 73

In a short quiz, 3 pupils scored 1 mark, 5 pupils scored 2 marks and 4 pupils scored 3 marks. How many pupils took the quiz?

  1. 6, from adding the three scores 1, 2 and 3
  2. 12Correct answer
  3. 25
  4. 18, from adding the group sizes and the scores together

Explanation

Each pupil is counted once by the number attached to the score they earned, so the group contains 3 + 5 + 4 = 12 pupils. Adding the scores 1, 2 and 3 to get 6 counts the marks that could be earned instead, and no pupil is counted by that sum at all.

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Question 73: In a short quiz, 3 pupils scored 1 mark, 5 pupils scored 2… · Statistics and Probability · Questena