The incubation period for a virus (time from exposure until first symptom) is normally distributed with...

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The incubation period for a virus (time from exposure until first symptom) is normally distributed with mean 13 days and standard deviation 4 days. A researcher wishes to see how rare a certain group's average incubation time is, so a sample of 9 people is taken. What is the probability of that sample's mean incubation time being less than 11.28 days? Round your answer to 4 decimal places. The incubation period for a virus (time from exposure until first symptom) is normally distributed with mean 13 days and standard deviation 4 days. A researcher wishes to see how rare a certain group's average incubation time is, so a sample of 9 people is taken. What is the probability of that sample's mean incubation time being less than 11.28 days? Round your answer to 4 decimal places.