You own an investment which has an arithmetic mean return of 30% and a standard deviation of 15%. What is the probability that you will earn a return in any given year that exceeds 0% (it is a positive rate of return)? Select one: a. 95.44% b. 97.72% c. 4.56% d. 0.26% e. 2.28% f. 68.26%

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