5.32 Luca Alberti, a Hungarian florist, is considering two alternative investments. In both cases she is unsure about the percentage return but believes that her uncertainty can be represented by normal distributions with the means and standard deviations shown in the accompanying table. Luca wants to make the investment that is more likely to produce a return of at least 9%. Which investment should she choose?

Mean Standard Deviation Investment A 11.2 4.0 Investment B 10.0 2.5