The frequency distribution table below shows the marks distribution of a class of 30 students...

The frequency distribution table below shows the marks distribution of a class of 30 students in
an aptitude test. The mean mark of the distribution is 52.
Marks 10 20 30 40 50 60 70 80 90
No. of
students

1 1 X 5 Y 1 4 3 1

(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) prepare a cumulative frequency table and use it to draw the cumulative frequency curve
(d) use the curve to estimate

(i) the median
(ii) interquartile range
(e) the cut-off was 63%, what percentage of the students were selected?

In Mathematics
1 Answers Available
Asked by Josie on 9th June, 2021