NDA 2017 Paper 1 | Statistics Question 33 | Mathematics

For given statistical data, the graphs for less than ogive and more than ogive are drawn. If the point at which the two curves intersect is P, then abscissa of point P gives the value of which one of the following measures of central tendency?

Median

Mean

Mode

Geometric mean

NDA 2017 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

If the regression coefficient of x on y and y on x are $$ - {1 \over 2}$$ and $$ - {1 \over 8}$$, respectively then what is the correlation coefficient between x and y?

$$ - {1 \over 4}$$

$$ - {1 \over 16}$$

$$ {1 \over 16}$$

$$ {1 \over 4}$$

NDA 2017 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

A sample of 5 observations has mean 32 and median 33. Later it is found that an observation was recorded incorrectly as 40 instead of 35. If we correct the data, then which one of the following is correct?

The mean and median remains the same

The median remains the same but the mean will decrease

The mean and median both will decrease

The mean remains the same but median will decrease

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

The correlation coefficient computed from a set of 30 observations is 0.8. Then, the percentage of variation not explained by linear regression is

80%

20%

64%

36%

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Questions Asked from Marks 2.5

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