Question

1.

Based on the frequency distribution above, find the relative frequency for the class with lower class limit 31. 

Relative Frequency = _______ % 

2. 

Based on the frequency distribution above, find the cumulative frequency for the class with lower class limit 31.

Cumulative Frequency = _______ 

Answer 1

Frequency for the class with lower class 31 is = 9

total of frequency = 2+4+8+8+9+2 = 33

Ages	Number of student
15-18	2
19-22	4
23 - 26	8
27-30	8
31-34	9
35-38	2

We Round the relative frequency up to 1 decimal place

Answer :-

Now next part

For cumulative frequency we add all the previous frequency including those class frequency

Ages	Number of student	Cumulative frequency
15-18	6	6
19-22	10	= 6 + 10 = 16
23 - 26	3	= 6 + 10 + 3 = 19
27-30	2	= 6 + 10 + 3 + 2 = 21
31-34	5	= 6 + 10 + 3 + 2+ 5 =26
35-38	7	= 6 + 10 + 3 + 2+ 5 + 7 =33

Cumulative frequency for the class with Lower limit = 26

Final answer :

Cumulative frequency = 26