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Normal Distribution

According to a recent study, the average night’s sleep is 8 hours. Assume that the standard deviation is 1.1 hours and that the probability distribution is normal.
What is the probability that a randomly selected person sleeps for more than 8 hours? (
and
Doctors suggest getting between 7 and 9 hours of sleep each night. What percentage of the population gets this much sleep?
working please.

User Tri Dawn
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Answer:

I think the answer for the 1st one is 1/2 and for 2nd one it's 1.25%

User Khurram Shehzad
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