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1.
The values of mean, median and mode coincide, then the distribution is
2.
If 
and 
, then the coefficient of correlation is
and , then the coefficient of correlation is
3.
The mode of the series 3,4,2,6,1,7,6,7,6,8,9,5 is
4.
A data has highest value 120 and lowest value 71. A frequency distribution in descending order with seven classes is to be constructed. The limits of the second classes-interval shall be
5.
A group of 10 items has arithmetic mean 6. If the arithmetic mean of 4 of these items is 
then the mean of the remaining items is
then the mean of the remaining items is
6.
The weighted mean of first 
natural numbers whose weights are equal is given by
natural numbers whose weights are equal is given by
7.
The variance of the first natural numbers is
natural numbers is
8.
Following are the marks obtained by 9 students in Mathematics test: 
The mean deviation from the median is
The mean deviation from the median is
9.
If the median of 
is 
then 
is then
10.
Coefficient of skewness for the values
Median = 18.8,
is
Median = 18.8,