I have a financial calculator and am trying to use it to calculate the standard deviation when probability is involved.
For a standard deviation question say on the numbers $1$, $5$, $6$, $10$
Press 1, E+ Press 5, E+ Press 6, E+ Press 10, E+ Press Stat Button - ox
Answer $3.2$
However I have just been presented with a question in the format
$\begin{array}{l|l} \text{Probability}&\text{Score}\\ \hline 0.1&1\\ 0.3&5\\ 0.4&6\\ 0.2&10 \end{array}$
With the forumla:
$\text{stdev}^2 = \sum (\text{Probability} \times (\text{Score} - \text{Average Score}))^2$
How would I do this on my calculator?