A Recent Analysis of the Number of Rainy Days Per

Multiple Choice

A recent analysis of the number of rainy days per month found the following outcomes and probabilities. $$\begin{array} { | c | c | } \hline \text { Namber of Raining Days } ( x ) & \mathrm { P } ( x ) \\\hline \hline 3 & .40 \\\hline 4 & .20 \\\hline 5 & .40 \\\hline\end{array}$$ The standard deviation of this distribution is _____________.

A) .800
B) .894
C) .400
D) 4.00
E) .457