Further Mathematics Paper 2, WASSCE (PC), 2023

QUESTION 13

  1. The mean of four consecutive odd numbers is 6. Find, correct to one decimal place, their variance.
  2. The table shows the distribution of marks obtained by a group of candidates in an examination.

 

Marks

0-19

20-39

40-59

60-79

80-99

Number of Candidates

8

14

18

6

4

If three candidates are selected at random from the group, find, correct to three decimal places, the probability that two of them are from the modal class.

Observation

 

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