NDA 2017 Paper 1 | Statistics Question 28 | Mathematics

If two regression lines between height (x) and weight (y) are 4y $$-$$ 15x + 410 = 0 and 30x $$-$$ 2y $$-$$ 825 = 0, then what will be the correlation coefficient between height and weight?

$${1 \over 3}$$

$${1 \over 2}$$

$${2 \over 3}$$

$${3 \over 4}$$

NDA 2017 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

In an examination, 40% of candidates got second class. When the data are represented by a pie chart, wheat is the angle corresponding to second class?

40$$^\circ$$

90$$^\circ$$

144$$^\circ$$

320$$^\circ$$

NDA 2017 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

Consider the following statements :

Statement 1 : Range is not a good measure of dispersion.

Statement 2 : Range is highly affected by the existence of extreme values.

Which one of the following is correct in respect of the above statements?

Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1

Both Statement 1 and Statement 2 are correct but Statement 2 is not the correct explanation of Statement 1

Statement 1 is correct but Statement 2 is not correct

Statement 2 is correct but Statement 1 is not correct

NDA 2017 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

If the data are moderately non-symmetrical, then which one of the following empirical relationships is correct?

2 $$\times$$ Standard deviation = 5 $$\times$$ Mean deviation

5 $$\times$$ Standard deviation = 2 $$\times$$ Mean deviation

4 $$\times$$ Standard deviation = 5 $$\times$$ Mean deviation

5 $$\times$$ Standard deviation = 4 $$\times$$ Mean deviation

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