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**Q190.** An eager campaign volunteer wants to think rationally about where to put her time. She does her research about phone-banking and canvassing and discovers the following.

A full shift (calling hundreds!) at phone banking has a 10% chance of producing 20 votes and a 60% chance of producing 2 votes, 10% chance of producing no votes and a 20% chance of losing 2 votes. Canvassing, by comparison, has a 20% chance of producing 8 votes, 30% chance of producing 4 votes, and a 50% chance of producing no votes. Other things being equal, which would be a better use of her time?