1
JEE Main 2016 (Online) 9th April Morning Slot
+4
-1
If the mean deviation of the numbers 1, 1 + d, ..., 1 +100d from their mean is 255, then a value of d is :
A
10.1
B
20.2
C
10
D
5.05
2
JEE Main 2016 (Offline)
+4
-1
If the standard deviation of the numbers 2, 3, a and 11 is 3.5, then which of the following is true?
A
3$$a$$2 - 26$$a$$ + 55 = 0
B
3$$a$$2 - 32$$a$$ + 84 = 0
C
3$$a$$2 - 34$$a$$ + 91 = 0
D
3$$a$$2 - 23$$a$$ + 44 = 0
3
JEE Main 2015 (Offline)
+4
-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 :
A
15.8
B
14.0
C
16.8
D
16.0
4
JEE Main 2014 (Offline)
+4
-1
The variance of first 50 even natural numbers is
A
833
B
437
C
$${{437} \over 4}$$
D
$${{833} \over 4}$$
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