NDA 2017 Paper 1 | Statistics Question 35 | Mathematics

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%

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

The average age of a combined group of mean and women is 25 yr. If the average age of the group of men is 26 yr. and that of the group of women is 21 yr, then the percentage of men and women in the group is respectively

20, 80

40, 60

60, 40

80, 20

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

Consider the following statements

1. If 10 is added to each entry on a lists, then the average increases by 10.

2. If 10 is added to each entry on a list, then the standard deviation increases by 10.

3. If each entry on a list is doubled then the average doubles.

Which of the above statements are correct?

1, 2 and 3

1 and 2

1 and 3

2 and 3

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