3) The length of time to complete a door assembly on a automobile factory assembly line is normally distributed with mean = 6.7 minutes and standard deviation = 2.2 minutes. For a door selected at random, what is the probability the assembly line will be
a) 5 minutes or less
Solution: Letbe the random length of time to complete a door assembly. The probability we are looking for is
b) 10 minutes or less
Solution: We need to find
c) between 5 and 10 minutes
Solution: Now we need to find
d) more then 10 minutes
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