The following ages (rounded to the nearest whole year) of employees at a large company that were grouped into a distribution with class limits: 20 up to 30
30 up to 40
40 up to 50
50 up to 60
60 up to 70
(i. The class limits for the class 50 up to 60 class are 50 and60.
(ii. The midpoint for the class 40 up to 50 is 45.
(iii) The class interval is 10.
A) (i), (ii) and (iii) are all correct statements.
B) (i), (ii) and (iii) are all false statements.
C) (i) and (ii) are correct statements but not (iii).
D) (ii) and (iii) are correct statements but not (i).

Question

Quizplus · Accepted Answer

(i) is correct as it states the class limits for the 50 up to 60 class. 
(ii) is correct as it gives the midpoint formula as (lower limit + upper limit)/2, which in this case would be (40+50)/2 = 45. 
(iii) is correct as it states the class interval as 10. Therefore, all three statements are correct.

The Following Ages (Rounded to the Nearest Whole Year) of Employees