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Joan’s finishing time for the Bolder Boulder 10K race was 1.83 standard deviations faster than the women’s average for her age group. There were 375 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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Answer:

Answer and Explanation:

This means she ran faster than about 96.56% of the women in her age group, and so she ran slower than 3.44% of the women in her age group. Rounding down to the nearest whole number, 13 women ran faster than Joan.

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