Question

14.
The class marks of a distribution are 2.5, 7.5, 12.5, 17.5. What is the width of the class?
Answer:​

Answer 1

Step-by-step explanation:

find the difference between two consecutive class marks

=> 7.5 - 2.5 => 5

divided the difference by 2 to get adjustment factor AF

here AF = 5/2 => 2.5

now subtract AF from each class mark to obtain lower limit and add AF to each class mark to get upper limit

2.5 - 2.5 - 2.5 + 2.5 => 0 - 5

7.5 - 2.5 + 7.5 + 2.5 => 5 - 10

and continue

Answer 2

Answer:

-5 is the width of the class