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2 marksCumulative Frequency Curve (Ogive)

CSEC Mathematics · January 2005 · Paper 2 · Question 7(i)

The graph shows the cumulative frequency curve for the marks scored on a test by a class of 80 students. Use the graph to estimate:

Estimate the number of students who scored less than 23 marks.

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Other parts of this question

  1. 7(ii)Estimate the number of students who scored more than 17 marks.[2 marks]
  2. 7(iii)Estimate the interquartile range of the marks scored.[3 marks]
  3. 7(iv)Estimate the probability that a randomly chosen student from the class scored between 17 marks and 23 marks.[3 marks]
  4. 7(v)Estimate the value of x if only 30 students from the class scored more than x marks.[2 marks]

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