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1.
Suppose a population A has 100 observations 101,102,.,200 and another population B has 100 observations 151,152,.,250 if 
and 
represent the variances of the two populations respectively, then 
is
and represent the variances of the two populations respectively, then is
2.
The SD of 15 items is 6 and if each item is decreases by 1, then standard derivation will be
3.
If the 
of a variate 
is 
then the S.D. of 
is
of a variate is then the S.D. of is
4.
The mean weight of 9 items is 15. If one more item is added to the series, the mean becomes 16. The value of 10th item is
5.
The mean deviation from the mean of the set of observations, -1, 0, 4 is
6.
The regression coefficient of y on 
is 2/3 and that of on y is 4/3 . The acute angle between the two regression lines is 
where k is equal to
is 2/3 and that of on y is 4/3 . The acute angle between the two regression lines is where k is equal to
7.
The mean of the numbers 
is 6 and the variance is 6.80. Then, which one of the following gives possible values of 
and
?
is 6 and the variance is 6.80. Then, which one of the following gives possible values of and?
8.
The mean-deviation and coefficient of mean deviation from the data. Weight (in kg) 54, 50, 40, 42, 51, 45, 47, 55, 57 is
9.
The weighted AM of first 
natural numbers whose weights are equal to the corresponding numbers is equal to
natural numbers whose weights are equal to the corresponding numbers is equal to
10.
The median of 
is
is