The equation for standard deviation is?

For the given set of data, find

(i) Standard deviation
(ii) Standard deviation, if the outlier score is ignored

The data set of number of children in some families given. Find the standard deviation.

The data set of movie ratings is given. Find

(i) The mean, correct to 2 decimals
(ii) Standard deviation, correct to 3 decimals

For the given set of data

\[28,\,29,\,32,\,33,\,36,\,37\]

Find the standard deviation, correct to 1 decimal place

For the given set of data

\[3,\,4,\,6,\,8,\,9\]

Find the standard deviation, correct to 1 decimal place

From the adjacent dot plot, determine the standard deviation, correct to 1 decimal place

From the following stem-and-leaf graph, determine the standard deviation, correct to 1 decimal place

\begin{array}{r|l}
\hline \text { Stem } & \text { Leaf } \\
\hline 0 & 4 \\
\hline 1 & 1\,2\,6 \\
\hline 2 & 0\,2 \\
\hline
\end{array}

From the following back to back stem-and-leaf plots, determine the standard deviation of each group. 

\begin{array}{r|l|l}
\hline \text { Year 7 } & & \text { Year } 12 \\
\hline 1 & 0 & 1\,2 \\
\hline 6\,2 & 1 & 2\,3 \\
\hline 9\,8\,4 & 2 & 4\,5\,7 \\
\hline 8\,6\,4 & 3 & 1 \\
\hline 2\,1 & 4 & \\
\hline
\end{array}