Maths-
General
Easy
Question
The frequency distribution of the marks obtained by 100 students in a test carrying 50 marks is given below Then the mean is
- 28.3
- 28
- 27.3
- 26.4
Hint:
The direct method is the simplest method to find the mean of the grouped data. The steps that can be followed to find the mean for grouped data using the direct method are given below,
- Create a table containing four columns as given below,
Column 1- Class interval.
Column 2- Class marks (corresponding), denoted by xi
.
Column 3- Frequencies (
) (corresponding)
Column 4- 
(corresponding product of column 2 and column 3)
- Calculate Mean by the Formula Mean = ∑/∑
Column 1- Class interval.
Column 2- Class marks (corresponding), denoted by xi
.Column 3- Frequencies (
) (corresponding)Column 4-
(corresponding product of column 2 and column 3)/∑The correct answer is: 28.3
Given :
The frequency distribution of the marks obtained by 100 students in a test carrying 50 marks is given below
Step 1 : Create a table containing four columns as given below,
Class interval
0-9
8
36
10-19
15
217.5
20-29
20
490
30-39
45
1552.5
40-49
12
534
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