What is the mean of a-2, a, a+2

What is the median of the data 10 ,15 ,11, 6, 9, 14 ,12, 8, 16

What is mode of the data 1, 1, 1, 2 , 2, 2, 3, 3, 3 , 4 , 4, 4, 5, 5 ,5

If the mean of the data 6, 9, 12, 8, 4, 0 , x and 4 is 6 then X=

What is mode of the data 5, 6, 5, 9, 5, 6, 10, 11, 5, 6, 7, 6, 9, 5

In Step deviation method mean               $\overline{x}$  = a + $\frac{\Sigma f_{i\ }u_i}{\Sigma f_{i\ }}\times h$  . Here "a" means

For grouped data median is calculated by M =  $l$   + $\frac{\frac{n}{2}-cf}{f}\times\ h$  . Here " $l$  " means 

In deviation method the formula to calculate mean is given by

The formula to calculate mode for grouped data is

In calculating mean if assumed mean is equal to actual mean then $\Sigma f_id_i\ =$