1
NDA Mathematics 21 April 2024
MCQ (Single Correct Answer)
+2.5
-0.83

Consider the following for the next two (02) items that follow:

$x_i$123... $n$
$f_i$1$2^{-1}$$2^{-2}$...$2^{-(n-1)}$

What is the mean of the distribution?

A

$\frac{2^{n+1} - n + 2}{2^{n}-1}$

B

$\frac{2^{n+1} - n - 2}{2^{n-1}}$

C

$\frac{2^{n+1} - n - 2}{2^{n}-1}$

D

$\frac{2^{n+1} - n + 2}{2^n}$

2
NDA Mathematics 21 April 2024
MCQ (Single Correct Answer)
+2.5
-0.83

Consider the following for the next two (02) items that follow:

The marks obtained by 10 students in a Statistics test are 24, 47, 18, 32, 19, 15, 21, 35, 50 and 41.

What is the mean deviation of the largest five observations?

A

4.8

B

5.5

C

6

D

7.5

3
NDA Mathematics 21 April 2024
MCQ (Single Correct Answer)
+2.5
-0.83

Consider the following for the next two (02) items that follow:

The marks obtained by 10 students in a Statistics test are 24, 47, 18, 32, 19, 15, 21, 35, 50 and 41.

What is the variance of the largest five observations?

A

14.6

B

21.8

C

25.2

D

46.8

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