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3. The mean time taken to assemble a car in a certain plant is a random...

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.                           

Math   Statistics-And-Probability   
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