Customers at the restaurant have to wait an average of 25 minutes before they receive their meal from the time their ord

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Customers at the restaurant have to wait an average of 25
minutes before they receive their meal from the time their order
was placed.
Assume these waiting times are normally distributed with a
standard deviation of 5 minutes.
1.1 What is the probability that a randomly selected customer
waits between 20 and 35 minutes before receiving his meal from the
time his order was placed?
1.2 What is the maximum waiting time for a customer to receive
her meal if she is in the 10% of customers who receive their meals
in the fastest time from when the order was placed?