1
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
2
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
3
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
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Consider the following statements

1. The algebraic sum of deviations of a set of values from their arithmetic mean is always zero.

2. Arithmetic mean > Median > Mode for a symmetric distribution.

Which of the above statements is/are correct?
A
Only 1
B
Only 2
C
Both 1 and 2
D
Neither 1 nor 2
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