1 markStatistical Inferences
CSEC Mathematics · January 2013 · Paper 2 · Question 7(c)
Explain why the value of the mean obtained in (b)(ii) is only an estimate of the true value.
The mark scheme is shown once you've answered.
Practise this questionOther parts of this question
- 7(a)(i)State the modal class interval.[1 mark]
- 7(a)(ii)State the class interval in which a score of 19.4 would lie.[1 mark]
- 7(b)(i)a)Copy and complete the table to show the class mid-points.[2 marks]
- 7(b)(i)b)Copy and complete the table to show the values of "f x x".[2 marks]
- 7(b)(ii)Calculate the mean score for the sample.[3 marks]
- 7(d)What is the probability that a student selected at random qualifies for the next round?[2 marks]
More practice: the rest of this paper · more Statistical Inferences questions · all CSEC Mathematics past papers