Ages of 90 people in an apartment are given in the adjacent grouped frequency distribution. i) How many Class Intervals are there in the table?

Question

Ages of 90 people in an apartment are given in the adjacent grouped frequency distribution.

Ages	No. of people
1-10	15
11-20	14
21-30	17
31-40	20
41-50	18
51-60	4
61-70	2

i) How many Class Intervals are there in the table? 

ii) How many people are there in the Class Interval 21 – 30? 

iii) Which age group people are more in that apartment? 

iv) Can we say that both people the last age group (61-70) are of 61, 70 or any other age?   

Answer 1

i) 7    

ii) 17    

iii) 31 – 40    

iv) Yes, they are 62, 63, ……, 69