JEE Main 2016 (Online) 10th April Morning Slot | Statistics Question 107 | Mathematics

The mean of 5 observations is 5 and their variance is 124. If three of the observations are 1, 2 and 6 ; then the mean deviation from the mean of the data is :

2.4

2.8

2.5

2.6

JEE Main 2016 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

If the mean deviation of the numbers 1, 1 + d, ..., 1 +100d from their mean is 255, then a value of d is :

10.1

20.2

5.05

JEE Main 2016 (Offline)

MCQ (Single Correct Answer)

-1

If the standard deviation of the numbers 2, 3, a and 11 is 3.5, then which of the following is true?

3$$a$$² - 26$$a$$ + 55 = 0

3$$a$$² - 32$$a$$ + 84 = 0

3$$a$$² - 34$$a$$ + 91 = 0

3$$a$$² - 23$$a$$ + 44 = 0

JEE Main 2015 (Offline)

MCQ (Single Correct Answer)

-1

The mean of the data set comprising of 16 observations is 16. If one of the observation valued 16 is deleted and three new observations valued 3, 4 and 5 are added to the data, then the mean of the resultant data, is :

15.8

14.0

16.8

16.0

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