Measures of Cen...

The median of a set of $$9$$ distinct observations is $$20.5$$. If each of the largest $$4$$ observation of the set is increased by $$2$$, then the median of the new set

In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class are 72, then the average marks of the girls :

If mode of the following data is $$7$$, then the value of $$k$$ in the $$2, 4, 6, 7, 5, 6, 10, 6, 7, 2k + 1, 9, 7, 13$$ is:

The numbers $$3, 5, 7$$ and $$9$$  have their respective frequencies $$ x-2, x+2, x-3 $$  and $$ x+3$$. If the arithmetic mean is $$6.5$$, then the value of $$ x$$ is

Mode of the data
$$15, 14, 19, 20, 14, 15, 16, 14, 15, 18, 14, 19, 15, 17, 15$$ is

Median of the following numbers:
$$4, 4, 5, 7, 6, 7, 7, 12, 3$$ is

The mean is

If three sets of data had means of $$15, 22.5$$ and  $$24$$  based on $$6, 4,$$ and $$5$$ observations respectively, then the mean of these three sets combined is

The mean weight of $$20$$  students is $$25$$ kg and the mean weight of another $$10$$ students is $$40$$ kg. Find the mean weight of the $$30$$ students.

The number of observations in a group is $$40$$ . If the average of first  $$10$$  is  $$4.5$$  and that of the remaining  $$30$$  is  $$3.5$$, then the average of the whole group is