SOLUTION: Could someone explain this to me because the book was no help. The random variable x has the following probability distribution: x 1 2 3 4

Question 359027: Could someone explain this to me because the book was no help.

The random variable x has the following probability distribution:
x 1 2 3 4 5
___________________________________________________
P(x) 0.6 0.1 0.1 0.1 0.1
a.) Find the mean and standard deviation of x.
b). What is the probability that x is between mean - standard deviation and mean + standard deviation?

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
is the mean.

.
.
.
Calculate the variance first, then .

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