3. The mean time taken to assemble a car in a certain
plant is a random variable having a normal distribution of 20 hours
and a standard deviation of 2 hours.
a. Find the probability that a randomly selected a car can be
assembled less than 19.5
hours.
b. Find the probability that a randomly selected a car can be
assembled between 20 and
22 hours.
c. Find the probability that a randomly selected a car can be
assembled more than 21
hours.
d. Find the probability that a randomly selected a car can be
assembled between 18 and
22 hours.
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