Frequency conditions on test scores

Frequency conditions on test scores

Secondary 2
6 marks
TGM Original Questions

Core stretch

Scores 4, 6, 7, 8, 9 have frequencies \(5,x,4,3,2\). Conditions are independent. Find

  1. \(x\) if the median is 6.5,[3]
  2. the least \(x\) if 6 is the unique mode,[1]
  3. the mean if the number scoring 6 is half the number scoring 7.[2]

Solution:

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Answer:(a) \(4\) (b) \(6\) (c) \(6.375\).

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