The mean deviation of the numbers $3, 4, 5, 6, 7$ is

When a die is rolled $42$ times, it is observed that a face having the digit $i$ occurred $2i$ times. The mean deviation from the mean of this discrete frequency distribution is

If $M_1$ is the mean deviation from the mean of the discrete data $44, 5, 27, 20, 8, 54, 9, 14, 35$ and $M_2$ is the mean deviation from the median of the same data,then $M_1 - M_2 =$

The mean deviation from the median for the following distribution (corrected to $2$ decimals) is

$x_i$	$3$	$6$	$9$	$12$	$13$	$15$	$21$	$22$
$f_i$	$3$	$4$	$5$	$2$	$4$	$5$	$4$	$3$

The mean deviation from the mean for the observations $1, 3, 5, 7, 11, 13, 17, 19, 23$ is

Let $O$ be the mean deviation of the first five odd natural numbers about their mean and $P$ be the mean deviation of the first five prime numbers about their mean. Then $P-O=$