

Question

The following table shows the distribution of test scores in a class.



Scores
1
2
3
4
5
7
8
9
10


No of pupils
1
1
5
3
\(k^{2} + 1\)
6
2
3
4



(a) If the mean score of the class is 6, find the : (i) value of k (ii) median score.
(b) Draw a bar chart for the distribution.
(c) If a pupil is picked at random, what is the probability that he/ she will score less than 6?



The following table shows the distribution of test scores in a class.



Scores
1
2
3
4
5
7
8
9
10


No of pupils
1
1
5
3
\(k^{2} + 1\)
6
2
3
4


