The Probability Model Below Describes the Number of Thunderstorms That $$\begin{array} { l | c c c c } \text { Number of storms } & 0 & 1 & 2 & 3 \\\hline \text { Probability } & 0.1 & 0.2 & 0.4 & 0.3\end{array}$$

question 56

Multiple Choice

The probability model below describes the number of thunderstorms that a certain town may experience during the month of August. $$\begin{array} { l | c c c c } \text { Number of storms } & 0 & 1 & 2 & 3 \\\hline \text { Probability } & 0.1 & 0.2 & 0.4 & 0.3\end{array}$$ What is the standard deviation of the number of storms in August?

• A)0.88
• B)0.94
• C)0.66
• D)0.75
• E)0.77

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