1
NDA Mathematics 4 September 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

The mean and standard deviation (SD) of marks obtained by 50 students of a class in 4 subjects are given below :

Subject Mathematics Physics Chemistry Biology
Mean Marks 40 28 38 36
SD 15 12 14 16

Which one of the following subjects shows highest variability of marks ?

A
Mathematics
B
Physics
C
Chemistry
D
Biology
2
NDA Mathematics 4 September 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

The mean and standard deviation (SD) of marks obtained by 50 students of a class in 4 subjects are given below :

Subject Mathematics Physics Chemistry Biology
Mean Marks 40 28 38 36
SD 15 12 14 16

What is the coefficient of variation of marks in Mathematics ?

A
37.5%
B
38.0%
C
38.5%
D
39.0%
3
NDA Mathematics 4 September 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Consider the following grouped frequency distribution :

Class 0-10 10-20 20-30 30-40 40-50 50-60
Frequency 1 2 4 6 4 3

What is the median of the distribution ?

A
34
B
34.5
C
35
D
35.5
4
NDA Mathematics 4 September 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Consider the following grouped frequency distribution :

Class 0-10 10-20 20-30 30-40 40-50 50-60
Frequency 1 2 4 6 4 3

What is mean deviation about the median ?

A
11.4
B
11.1
C
10.8
D
10.5
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