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1 markClass Features

CSEC Mathematics · May/June 2006 · Paper 2 · Question 7(a)

In an agricultural experiment, the gains in mass, of 100 cows during a certain period were recorded in kilograms as shown in the table below.

Copy and complete the mid-interval values column.

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Other parts of this question

  1. 7(b)(i)Calculate an estimate of the mean gain in mass of the 100 cows. Hint: EACH of the 29 cows in the "10- 14" interval is assumed to have a mass of 12 kg.[3 marks]
  2. 7(b)(ii)On your answer sheet, complete the drawing of the frequency polygon for the gain in mass of the cows.[5 marks]
  3. 7(c)Calculate the probability that a cow chosen at random from the experimental group gained 20 kg or more.[2 marks]

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