QUESTION 13
- The mean of four consecutive odd numbers is 6. Find, correct to one decimal place, their variance.
- 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