The Quality Office Furniture Company has compiled the year's revenue expectations and their probabilities: Sales ($000) Probabilities

Question:

The Quality Office Furniture Company has compiled the year's revenue expectations and their probabilities:
Sales ($000) Probabilities
240...........................0.05
280...........................0.10
320...........................0.70
360...........................0.10
400...........................0.05
Calculate
a. The expected revenue
b. The standard deviation
c. The coefficient of variation