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The patient recovery time from a particular surgical procedure is normally distributed with a mean of 4 days and a standard deviation of 1.8 days.

The patient recovery time from a particular surgical procedure is normally distributed with a mean of 4 days and a standard deviation of 1.8 days. Let X be the recovery time for a randomly selected patient. Round all answers to 4 decimal places where possible.

f. The 90th percentile for recovery times is

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