Calculate the Expected Value, the Variance, and the Standard Deviation $\mu = E ( X ) =$

Short Answer

Calculate the expected value, the variance, and the standard deviation of the given random variable X. Please round your answers to two decimal places, if necessary.
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​X is the number of tails that come up when a coin is tossed two times.
​ $\mu = E ( X ) =$ __________
​ $\sigma ^ { 2 } =$ __________
​ $\sigma =$ __________