1
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
2
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Arithmetic mean of 10 observations is 60 and sum of squares of deviations from 50 is 5000. What is the standard deviation of the observations?
A
20
B
21
C
22.36
D
24.70
3
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The median of the observations 22, 24, 33, 37, x + 1, x + 3, 46, 47, 57, 58 in ascending order is 42. What are the values of 5th and 6th observations respectively?
A
42, 45
B
41, 43
C
43, 46
D
40, 40
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If two variables X and Y are independent, then what is the correlation coefficient between them?
A
1
B
$$-$$1
C
0
D
None of these
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