Table 5.15 provides a probability distribution for the random variable x.

Table 5.15 provides a probability distribution for the random variable x.

Table 5.15
x f(x)
3 0.25
6 0.50
9 0.25a. 

a. Compute the expected value of x, E(x)
Answer

b. Compute the variance of x, variance 2 (to 1 decimal).
Answer

c. Compute the standard deviation of x, variance (to 2 decimals).