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
For the given data, the calculation corresponding to all values of variates (x,y) is following.The karl Pearson's correlation coefficient is.
0. 2
0.5
0. 66
0. 33
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
The standard deviation of a variable x is 10. Then, the standard deviation of 50 +5x is
50
550
10
500
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 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
If the mean deviation of number 1, 1 + d, 1 + 2d,.... 1 + 100 d from their mean is 255, then d is equal to.
20
10. 1
20. 2
If r is Karl Pearson's coefficient of correlation between two sets of variates, then.
r < 1
r > 1
r < -1
| r | ≤ 1
The mode of the series 3, 4, 2, 6, 1, 7,6 7, 6, 8, 9, 5 is.
5
6
7
8
The mean deviation from the mean of the set of observations -1, 0, 4 is
3
1
-2
2
