The following table shows the probability distribution for a discrete random
variable.
X 13 16 18 21
23 25 26 31
P(X) 0.07 0.21 0.17 0.25 0.05 0.04 0.13 0.08
The mean of the discrete random variable Xis 20.59. What is the variance
of X? Round your answer to the nearest hundredth.
A. 33.15
B. 31.06
C. 23.18
D. 27.89