NDA 2018 Paper 1 | Statistics Question 54 | Mathematics

The mean and standard deviation of a set of values are 5 and 2 respectively. If 5 is added to each value, then what is the coefficient of variation for the new set of values?

NDA 2018 Paper 1

MCQ (Single Correct Answer)

+2.5

-0.83

The standard deviation $$\sigma$$ of the first N natural numbers can be obtained using which one of the following formulae?

$$\sigma = {{{N^2} - 1} \over {12}}$$

$$\sigma = \sqrt {{{{N^2} - 1} \over {12}}} $$

$$\sigma = \sqrt {{{N - 1} \over {12}}} $$

$$\sigma = \sqrt {{{{N^2} - 1} \over {6N}}} $$

NDA 2019 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

If V is the variance and M is the numbers, then what is V + M² equal to ?

$${{124} \over 3}$$

$${{148} \over 3}$$

$${{248} \over 3}$$

$${{124} \over 9}$$

NDA 2019 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

If the range of a set of observations on a variable X is known to be 25 and if Y = 40 + 3X, then what is the range of the set of corresponding observations on Y?

115

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