The following table shows the probability distribution for a discrete random variable. x 11 14 16 19 21 23 24 29 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 18.59. what is the variance of x? round your answer to the nearest hundredth.

Because the random variable X is discrete, the variance of X is defined as
var(X) = 

where
p =  values of probability as given in the table.
μ = 18.59

Calculate the array (x - μ).
x-μ = [-7.59 -4.59 -2.59 0.41 2.41 4.41 5.41 10.41]
Calculate the array (x-μ)².
(x- μ)² = [57.6081 21.0681 6.7081 0.1681 5.8081 19.4481 29.2681 108.3681]
Calculate the array p*(x-μ)².
p*(x- μ)² = [4.0326 4.4342 1.1404 0.042 0.2904 0.7779 3.8049 8.6694]
Calculate the variance of X.
var(X) = 23.182

23.18 (nearest hundredth)

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.