Marks
10
20
30
40
50
60
70
80
90


Frequency
1
1
x
5
y
1
4
3
1



The frequency distribution shows the marks distribution of a class of 30 students in an examination.
The mean mark of the distribution is 52.
(a) Find the values of x and y.
(b) Construct a group frequency distribution table starting with a lower class limit of 1 and class interval of 10.
(c) Draw a histogram for the distribution
(d) Use the histogram to estimate the mode.





Marks
10
20
30
40
50
60
70
80
90


Frequency
1
1
x
5
y
1
4
3
1
