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1 markAnalysis of Statistical Diagrams

CSEC Mathematics · January 2013 · Paper 2 · Question 7(a)(i)

The table shows scores obtained by 100 children in a competition, with columns for Score, Class mid-point (x), Frequency (f), and f x x.

State the modal class interval.

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Other parts of this question

  1. 7(a)(ii)State the class interval in which a score of 19.4 would lie.[1 mark]
  2. 7(b)(i)a)Copy and complete the table to show the class mid-points.[2 marks]
  3. 7(b)(i)b)Copy and complete the table to show the values of "f x x".[2 marks]
  4. 7(b)(ii)Calculate the mean score for the sample.[3 marks]
  5. 7(c)Explain why the value of the mean obtained in (b)(ii) is only an estimate of the true value.[1 mark]
  6. 7(d)What is the probability that a student selected at random qualifies for the next round?[2 marks]

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