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
The mode of the series 3, 4, 2, 6, 1, 7,6 7, 6, 8, 9, 5 is:
5
6
7
8
The standard deviation of a variable x is 10. Then, the standard deviation of 50 +5x is:
50
550
10
500
If r is Karl Pearson's coefficient of correlation between two sets of variates, then:
r < 1
r > 1
r < -1
| r | ≤ 1
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 the variance of 1,2,3,4, ... 10 is 99/12, then the standard deviation of 3, 6, 9, 12, .... 30 is:
Consider the following statements i. Mode can be computed from histogram ii. Median is not independent of change of scale iii. Variance is independent of change of origin and scale Which of these is/ are correct?
Only (1)
Only (ii)
Only (i) and (ii)
Only (i), (ii) and (iii)
and n = 10, then the coefficient of correlation is:
0.1
0.3
0.2
The mean deviation from the mean of the set of observations -1, 0, 4 is
3
1
-2
2
If var (x) = 8.25, var (y) = 33. 96 and cov (x,y) = 10.2then the correlation coefficient is:
0.89
-0.98
0.61
-0.16
