There are $50$ numbers. Each number is subtracted from $53$ and the mean of the numbers so obtained is found to be $-3.5$. The mean of the given numbers is: (in $.5$)

In the class intervals $10-20$ and $20-30$,the number $20$ is included in:

The value of $\pi$ up to $35$ decimal places is given below:
$3.14159265358979323846264338327950288$
Make a frequency distribution table of the digits $0$ to $9$ after the decimal point.

The marks obtained (out of $25$ marks) by $40$ students in an examination are as given below:
$\begin{array}{rrrrrrrrrr} 8, & 12, & 23, & 9, & 5, & 20, & 16, & 3, & 6, & 23 \\ 10, & 6, & 21, & 1, & 18, & 17, & 18, & 16, & 16, & 12, \\ 3, & 15, & 21, & 7, & 12, & 5, & 2, & 7, & 13, & 24, \\ 13, & 18, & 8, & 2, & 20, & 5, & 13, & 7, & 23, & 16 \end{array}$
Represent the data given above by a grouped frequency distribution table,taking the class intervals as $0-5, 5-10, \dots$ etc.

The facts or figures,which are numerical or otherwise,collected with a definite purpose are called .......

If each observation of the data is increased by $5,$ then their mean