Question

0 – 10, 11 – 20, 21 – 30, 31 – 40. The real lower limit of the class 21 – 30 is 

A) 21 

B) 30 

C) 20.5

D) 21.5

Answer 1

Correct option is (C) 20.5

Classes are 0–10, 11–20, 21–30, 31–40

Difference between lower limit of next class and upper limit of class = 1.

\(\therefore\) Classes converts to 0.5-10.5, 10.5-20.5, 20.5-30.5, 30.5-40.5

\(\therefore\) Real lower limit of the class 21-30 is 20.5.

Answer 2

Correct option is  C) 20.5