

Question



Marks
1
2
3
4
5


Number of students
m + 2
m - 1
2m - 3
m + 5
3m - 4



The table shows the distribution of marks scored by some students in a test.
(a) If the mean mark is \(3\frac{6}{23}\), find the value of m.
(b) Find the : (i) interquartile range
(ii) probability of selecting a student who scored at least 4 marks in the test.





Marks
1
2
3
4
5


Number of students
m + 2
m - 1
2m - 3
m + 5
3m - 4


