1
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Mean of 100 observations is 50 and standard deviation is 10. If 5 is added to each observation, then what will be the new mean and new standard deviation respectively?
A
50, 10
B
50, 15
C
55, 10
D
55, 15
2
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Consider the following discrete frequency distribution.

Image

What is the value of median of the distribution ?
A
4
B
5
C
6
D
7
3
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The mean of 5 observations is 4.4 and variance is 8.24. If three of the five observations are 1, 2 and 6, then what are the other two observations?
A
9, 16
B
9, 4
C
81, 16
D
81, 4
4
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The class marks in a frequency table are given to be 5, 10, 15, 20, 25, 30, 35, 40, 45, 50. The class limits of the first five classes are
A
3-7, 7-13, 13-17, 17-23, 23-27
B
2.5-7.5, 7.5-12.5, 12.5-17.5, 17.5-22.5, 22.5-27.5
C
1.5-8.5, 8.5-11.5, 11.5-18.5, 18.5-21.5, 21.5-28.5
D
2-8, 8-12, 12-18, 18-22, 22-28
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