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Today, 07:19

Given that the random variable x is normally distributed with a mean of 80 and a standard deviation of 10, p (85 < x < 90) is

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  1. Today, 07:48
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    I'd do this by using the normalcdf probability distribution function on my TI-83 Plus calculator: normalcdf (85,90,80,10). Result: 0.1499.

    You could also do this problem using z-scores.
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