The table shows the distribution of marks obtained by some pupils in a test
Marks |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
No of Pupils |
5 |
4 |
4 |
3 |
6 |
4 |
7 |
8 |
4 |
3 |
2 |
(a) Calculate the mean score for the class.
(b)
If the pass mark is 4, what is the probability that a pupil picked at random failed?
