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Joan's finishing time for the Bolder Boulder 10K race was 1.81 standard deviations faster than the women's average for her age group. There were 390

Joan's finishing time for the Bolder Boulder 10K race was 1.81 standard deviations faster than the women's average for her age group. There were 390 women who ran in her age group. Assuming a normal distribution, how many women ran faster than Joan?(Round down your answer to the nearest whole number.)

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