Statistics Test...

The mean weight of 9 students is 25 kg. If one more student is joined in the group the mean is unaltered, then the weight of the 10th student is

The sum of $$15$$ observations is $$434+x.$$ If the mean of the data is $$x,$$ then find $$x.$$

$$\sum _{ 1 }^{ 10 }{ x-\bar { x }  } $$=..............

If $$V$$ is the variance and $$M$$ is the mean of first $$15$$ natural numbers, then what is $$V+M^2$$ equal to ?

If the sum of squares of deviations of $$15$$ observations from their mean $$20$$ is $$240$$, then what is the value of coefficient of variation (CV)?

Mean deviation is lowest from 

The mean of first ten odd natural number is

If the mode of the following data $$10, 11, 12, 10, 15, 14, 15, 13, 12, x, 9, 7$$ is $$15$$, then the value of $$x$$ is:

The mode of 9, 8, 7, 7, 6, 3, 7, 2, 1, 7, 9 is

The highest score of a certain data exceeds in lowest score by $$16$$ and coefficient of range is $$\cfrac{1}{3}$$. The sum of the highest score and the lowest score is