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

a. Find the mean of the random variable.

b. Obtain the standard deviation of the random variable.

x

1

2

3

P(X=x)

0.4

0.1

0.5

a. Find the mean of the random variable.

=

nothing

(Round to two decimal places asneeded.)

b. Obtain the standard deviation of the random variable.

=

nothing

(Round to two decimal places asneeded.)