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1
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is the median of the numbers 4.6, 0, 9.3, $$-$$4.8, 7.6, 2.3, 12.7, 3.5, 8.2, 6.1, 3.9, 5.2 ?
A
3.8
B
4.9
C
5.7
D
6.0
2
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
In a test in Mathematics, 20% of the students obtained "first class". If the data are represented by a pie chart, what is the central angle corresponding to "first class" ?
A
20$$^\circ$$
B
36$$^\circ$$
C
72$$^\circ$$
D
144$$^\circ$$
3
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The mean and standard deviation of a set of values are 5 and 2 respectively. If 5 is added to each value, then what is the coefficient of variation for the new set of values?
A
10
B
20
C
40
D
70
4
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The standard deviation $$\sigma$$ of the first N natural numbers can be obtained using which one of the following formulae?
A
$$\sigma = {{{N^2} - 1} \over {12}}$$
B
$$\sigma = \sqrt {{{{N^2} - 1} \over {12}}} $$
C
$$\sigma = \sqrt {{{N - 1} \over {12}}} $$
D
$$\sigma = \sqrt {{{{N^2} - 1} \over {6N}}} $$
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