If the coefficient of variation is 45% and the mean is 12, then its standard deviation is:
5.2
5.3
5.4
5.5
If r is Karl Pearson's coefficient of correlation between two sets of variates, then:
r < 1
r > 1
r < -1
| r | ≤ 1
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)
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 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 standard deviation of a variable x is σ, then the standard deviation of another variable is:
σ
None of these
and n = 10, then the coefficient of correlation is:
0.1
0.3
0.2
The values of mean, median and mode coincide, then the distribution is:
Positive skewness
Symmetric distribution
Negative skewness
All of the above
1/5
-1/5
-2/5
2/5
The mean and variance of n observations x1, x2, ....x xn are 5 and 0 respectively. If xi2 = 400, then the value of n is equal to.
80
25
20
16