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7 October, 17:50

For women at hartford college, times to run 400 meters are normally distributed with a mean of 84 seconds and a standard deviation of 7 seconds. what percentage of the times are more than 91 seconds? more than 63 seconds?

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  1. 7 October, 21:44
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    z = (63-84) / 3 = - 21/7 = - 3

    P (x>63) = p (z > - 3) =.9987 or 99.87%
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