The average lifespan of a CleanFreek dishwasher is normally distributed with a mean of 9 years and a standard deviation of 1.8 years.

a.What is the probability that a CleanFreek dishwasher will last longer than 11 years?

P(X > 11)=

b.What is the probability that a CleanFreek dishwasher will last fewer than 6 years?

P(X < 6)=

c.What length warranty should be established on the dishwashers so that no more than 1.5% of the units will need to be replaced under warranty?

Round to 2 decimal places.

x= _______ years.