What is the cumulative Frequency?

Question

Answer 1

try a smaller table

xi f cf

2 1 1

3 2 3

4 1 4

frequency of 2 is one

frequency of 3 is two, and cumulative frequency of 3 is 1+2 =3 = sum of frequencies of score= 3 or less

frequency of 4 is one, but cumulative frequency of 4 is 1+2+1= 4 = sum of all the frequencies= sum of frequencies of score = 4 or less