Standard Deviation about Median

Q. Standard deviation for n observations $x_1,x_2\dots x_n$ is '5' then the standard deviation of n observations $5x_1,5x_2,\dots 5x_n$ will be ___

Q.

Find the mean, standard deviation and variance of first 10 multiples of 3.

Q. Standard deviation for n observations $x_1,x_2\dots x_n$ is '5' then the standard deviation of n observations $5x_1,5x_2,\dots 5x_n$ will be ___

Q. Find the standard deviation for the following data:
$\begin{array}{cccccc}{x}_i& 3& 8& 13& 18& 23\\ f_i& 7& 10& 15& 10& 6\end{array}$

1. 5.37
2. 15.92
3. 6.12
4. 13.87

Q. The following is the record of goals scored by team $A$ in a football session :

No. of goals scored	0	1	2	3	4
No. of matches	1	9	7	5	3

For the team $B$ mean number of goals scored per match was $2$ with a standard
deviation $1.25$ goals. Find which team may be considered more consistent ?

Q. Standard deviation for n observations $x_1,x_2,\dots x_n$ is 5, then the standard deviation for n observations $x_1+1,x_2+1,\dots x_{n+1}$ will be ___