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1.
The median of a set of 9 distinct observations is 20.5. if each of the largest 4 observations of the set is increased by 2, then the median of the new set
2.
Mean and standard deviation from the following observations of marks of 5 students of a tutorial group (marks out of 25)8, 12, 13, 15, 22 are respectively
3.
The mean age of a combined group of men and women is 25 yr. If the mean age of the group of men is 26 yr and that of the group of women is 21 yr, then the percentage of men and women in the group are respectively
4.
If 
is the GM of the product of 
sets of observations with geometric means 
respectively, then is equal to
is the GM of the product of sets of observations with geometric means respectively, then is equal to
5.
The frequency distribution of marks obtained by 28 students in a test carrying 40 marks is given below:
Marks : 0-10 10-20 20-30 30-40
Number of students : 6 x y 6
If the mean of the above data is 20, then the difference between x and y is
Marks : 0-10 10-20 20-30 30-40
Number of students : 6 x y 6
If the mean of the above data is 20, then the difference between x and y is
6.
Coefficient of deviation is calculated by the formula
7.
The standard deviation of the data 
is
is
8.
In a moderately skewed distribution the values of mean and median are 5 and 6 respectively. The value of mode in such a situation is approximately equal to
9.
If 
and 
are the means of two distributions, such that 
and 
is the mean of the combined distribution, then
and are the means of two distributions, such that and is the mean of the combined distribution, then
10.
The sum of deviations of 
observations about 25 is 25 and sum of deviations of the same observations about 35 is 
The mean of observations is
observations about 25 is 25 and sum of deviations of the same observations about 35 is The mean of observations is