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1.
The mean age of a combined group of men and women is 25 yrs. If the mean age of the group of men is 26 and that of the group of women is 21, then the percentage of men and women in the group is
2.
If the standard deviation of 
is 3.5, then the standard deviation of 
is
is 3.5, then the standard deviation of is
3.
If 
, then the standard derivation of 
is
, then the standard derivation of is
4.
The marks of some students were listed out of 75. The SD of marks was found to be 9. Subsequently the marks were raised to a maximum of 100 and variance of new marks was calculated. The new variance is
5.
If a variable 
takes values 
with frequencies proportional to the binomial coefficients 
then the 
is
takes values with frequencies proportional to the binomial coefficients then the is
6.
If the standard deviation of the observation 
is 
. The standard deviation of observations 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 will be
is . The standard deviation of observations 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 will be
7.
The, coefficient of SD and coefficient of variance from the given data is
|
Class interval |
0-10 |
10-20 |
20-30 |
30-40 |
40-50 |
|
Frequency |
2 |
10 |
8 |
4 |
6 |
8.
The mean of the distribution, in which the values of are 
the frequency of each being unity is:
are the frequency of each being unity is:
9.
The mean deviation from the median is
10.
If 
is Karl Pearsons coefficient of correlation between two sets of variates, then
is Karl Pearsons coefficient of correlation between two sets of variates, then