A discrete random variable X has the following probability distribution: -4 -3 -2 -1 2 3 0.05 0.075 0.4 0.07 0.06 0.1 0.2 a 0.03 The standard deviation a of X.

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A discrete random variable
X has the following probability distribution:
-4
-3
-2
-1
2
3
4
0.05
0.075
0.06
0.1
0.2
0.4
0.07
0.03
The standard deviation a of X.
Transcribed Image Text:A discrete random variable X has the following probability distribution: -4 -3 -2 -1 2 3 4 0.05 0.075 0.06 0.1 0.2 0.4 0.07 0.03 The standard deviation a of X.
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