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The Table Below Is the Probability Table for a Random

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The table below is the probability table for a random variable X. Find the standard deviation of X.  Outcome −1012 Probability 37171727\begin{array} { l | l l l l } \text { Outcome } & - 1 & 0 & 1 & 2 \\\hline \text { Probability } & \frac { 3 } { 7 } & \frac { 1 } { 7 } & \frac { 1 } { 7 } & \frac { 2 } { 7 }\end{array} Enter just a real number rounded off to two decimal places.

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