Which plan will give you the least red? Plan A: use 5 parts white and 2 parts red
Plan B: use 4 parts white and 1 part red

Calculate the mean value (expected value) of the following discrete variable x (10 points): x = 0, 1, 2, 3, 4, 5, 6 p(x) = 0.2, 0.2, 0.15, 0.15, 0.15, 0.1, 0.05