anonymous 5 years ago 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 X is 20.59. What is the variance of X? Round your answer to the nearest hundredth.

1. anonymous

Variance is the standard deviation squared. Just find the standard deviation: $st dev = \sqrt{\Sigma(x-xbar)^{2}/(n-1)}$

2. anonymous

i still don't understand what to input into the equation?