Question

Calculate arithmetic mean using Step-deviation Method.
3. The following table shows marks in Economics of the students of a class.
Calculate arithmetic mean using Direct Method
Marks
Number of Students
30
More than 0
More than 2
28
More than 4
24
More than 6
18
More than 8
10

Answer 1

Answer:

Converting Cumulative Frequency Distribution into a Simple Frequency Distribution, we get the following:

Arithmetic mean of this continuous series is estimated below, using Direct Method.

Arithmetic mean of this continuous series is estimated below, using Direct Method.

X¯¯¯=∑fm/∑f=19030=6.33

Arithmetic Mean = 6.33 marks.