the average lenght of a hospital stay is 5.9 days if we assume a normal distribution and a standard deviation of 1.7 days 15% of hospital stays are less than how many days? 25% of hospital stays are longer than how many days?

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- Oct 3rd 2007, 06:47 PMalderonstatistic
the average lenght of a hospital stay is 5.9 days if we assume a normal distribution and a standard deviation of 1.7 days 15% of hospital stays are less than how many days? 25% of hospital stays are longer than how many days?

- Oct 3rd 2007, 08:31 PMTKHunny
These are z-score lookup problems.

What z-score keeps 15% in the left tail? I'll call it 'a'.

Then (Days-5.9)/1.7 = a. Solve for 'Days'.