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The table below shows the probability distribution of the random variable X. x 1 2 3 P(X=x) 0.3 0.4 0.3 a . Find the mean

The table below shows the probability distribution of the random variable X.

x

1

2

3

P(X=x)

0.3

0.4

0.3

a. Find the mean of the random variable.

b. Obtain the standard deviation of the random variable.

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