The median of a set of 9 distinct observations is 20.5. If each of the largest 4 observations of the set is increased by 2, then the median of the new set.
is increased by 2
is decreased by 2
is two times the original median
remains the same as that of original set.
If the variance of 1,2,3,4, ... 10 is 99/12, then the standard deviation of 3, 6, 9, 12, .... 30 is
If the mean deviation of number 1, 1 + d, 1 + 2d,.... 1 + 100 d from their mean is 255, then d is equal to.
10
20
10. 1
20. 2
The standard deviation of a variable x is 10. Then, the standard deviation of 50 +5x is
50
550
500
If var (x) = 8.25, var (y) = 33. 96 and cov (x,y) = 10.2 then the correlation coefficient is
0.89
-0.98
0.61
-0.16
If in a frequency distribution, the mean and median are 21 and 22 respectively, then its mode is approximately.
24
25 . 5
20. 5
22. 0
If the coefficient of variation is 45% and the mean is 12, then its standard deviation is.
5.2
5.3
5.4
None of these
The standard deviation of n observations x1, x2, ---xn is 2. If xi2 = 100, then n is
10 or 20
5 or 10
5 or 20
5 or 15
If r is Karl Pearson's coefficient of correlation between two sets of variates, then.
r < 1
r > 1
r < -1
| r | ≤ 1
The mean deviation from the mean of the set of observations -1, 0, 4 is
3
1
-2
2
