Question

the following table shows the frequency distribution of marks of 100 students obtained in a practice examination prepare a less than cumulative frequency table from it.

Answer 1

Explanation:

Preparing a less than frequency distribution is very simple..

We know that 0-20=3students

Therefore we can say that 3 students got below 20.

Similarly, In less than 40 category , both 0-20 and 20-40 frequencies should be added i.e 3+21=24.

Keep proceeding in this way and you will obtain all the cf's(cumulative frequencies)

For your ease, I will also provide the answer but first try to do it yourself.

Answer:

Less than 20 = 3

Less than 40 = 24 (21+3)

Less than 60 = 49 (3+21+25 or 24+25)

Less than 80 = 89 (49+40)

Less than 100 = 100 (89+11 or total frequency) (Always the last number should have total frequency. This is very useful for verification).

Hope this helps. :-)