You have been given this probability distribution for the holding-period return for GM stock: 
What is the expected variance for GM stock?
Definitions:
Price Decrease
refers to a reduction in the cost of goods or services in the market.
Consumer
An individual or group that purchases goods or services for personal use, not for manufacture or resale.
Income
Money received, typically on a regular basis, for work or through investments.
Marginal Rate
A term that may refer to the rate at which one variable changes as another variable changes marginally, often used in the context of taxes, substitution, or transformation.
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