6-4B. (Expected rate ofreturn and risk) Kelly B. Stites, Inc., is considering an invesnnent in one of two common stocks. Given the information that follows, which invesnnent is better, based on risk (as measured by the standard deviation) and return?

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SECURITY A SECURITY B PROBABILITY RETURN PROBABILITY RETURN .20 -2% .10 5% .50 19% .30 7% .30 25% .40 12% 20 14%