The random variable A has the following probability distribution:
A 1 2 3 4 5
P(A) 0.6 0.1 0.1 0.1 0.1
a. Find the mean and standard deviation of A.
b. How much of the probability distribution is within 2 standard deviation of the mean?
c. What is the probability that A is between µ-2s and µ+2s?