The time it takes a person to complete the game Loop Hero follows anormal distributionwith a mean of 85 and a standard deviation of 15.
(a) What is the probability a person completes Loop Hero in less than 72 hours?
(b) What is the probability a person completes Loop Hero in more than 90 hours?
(c) What is the probability a person completes Loop Hero between 80 and 100 hours?
(d) 20% of people complete Loop Hero above how many hours?
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