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The Random Variable X Has the Following Probability Distribution

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The random variable x has the following probability distribution:
The random variable x has the following probability distribution:     a.Is this probability distribution valid? Explain and list the requirements for a valid probability distribution. b.Calculate the expected value of x. c.Calculate the variance of x. d.Calculate the standard deviation of x.
a.Is this probability distribution valid? Explain and list the requirements for a valid probability distribution.
b.Calculate the expected value of x.
c.Calculate the variance of x.
d.Calculate the standard deviation of x.

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a.yes f(x)...

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