Question

In the following cumulative frequency table, find the values of a, b, c and d.

The abscissa of the point of intersection of the less than type and of the more than type cumulative frequency curves of a grouped data gives its

The times, in seconds, taken by 150 atheletes to run a 110 m hurdle race are tabulated below: | Class | 13.8-14 | 14-14.2 | 14.2-14.4 | 14.4-14.6 | 14.6-14.8 | 14.8-15 | |-------|---------|---------|-----------|-----------|-----------|----------| | Frequency | 2 | 4 | 5 | 71 | 48 | 20 | The number of atheletes who completed the race in less then 14.6 seconds is:

The following table shows the cumulative frequency distribution of marks of 800 students in an examination: | Marks | Number of students | |-------|--------------------| | Below 10 | 10 | | Below 20 | 50 | | Below 30 | 130 | | Below 40 | 270 | | Below 50 | 440 | | Below 60 | 570 | | Below 70 | 670 | | Below 80 | 740 | | Below 90 | 780 | | Below 100 | 800 | Construct a frequency distribution table for the data above.