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2 marksFrequency Tables

CSEC Mathematics · January 2006 · Paper 2 · Question 7(a)

The data below are the lengths, to the nearest centimetre, of the right foot of the 25 students in a class: 14, 15, 16, 16, 17, 18, 18, 18, 19, 19, 20, 20, 21, 22, 22, 22, 22, 23, 23, 24, 25, 25, 26, 27.

Copy and complete the following grouped frequency table for the data above. Length of Right Foot (cm): 14-16 (Frequency 4), 17-19, 20-22 (Frequency 8), 23-25 (Frequency 5), 26-28 (Frequency 2).

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Other parts of this question

  1. 7(b)State the lower boundary of the class interval 14-16.[1 mark]
  2. 7(c)State the width of the class interval 20-22.[1 mark]
  3. 7(d)A student's right foot measured 16.8 cm. State the class interval in which this length would lie.[1 mark]
  4. 7(e)A student was chosen at random from the group, and the length of his right foot was measured. Calculate the probability that the length was GREATER THAN or…[2 marks]
  5. 7(f)State the modal length of a student's right foot.[1 mark]
  6. 7(g)Calculate an estimate of the mean length of a student's right foot using the midpoints of the class intervals in (a) above.[3 marks]

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