Consider the following distribution :

Marks obtained

Number of students

 

More than or equal to 0
More than or equal to 10
More than or equal to 20
More than or equal to 30
More than or equal to 40
More than or equal to 50

 

63
58
55
51
48
42

the frequency of the class 30-40 is
(A) 3                (B) 4                (C) 48              (D) 51

Answers (1)

Answer.    [A]
Solution.  Frequency distribution:
It tells how frequencies are distributed over values in a frequency distribution. However mostly we use
frequency distribution to summarize categorical variables.

Marks obtained  Cumulative Frequency  Frequency
0-10 63 5
10-20 58 3
20-30 55 4
30-40 51 3
40-50 48 6
50-60 42 42

 So the frequency of class 30 – 40 is 3.

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