What is the length of time to complete a door assembly on an automobile factory?


Posted March 6th, 2010 by admin 2 Comments »
automobile
FeFe asked:


The length of time to complete a door assembly on an automobile factory assembly line is normally distributed with a mean MU=7.9 minutes and standard deviation δ = 1.9 minutes. For a door selected at random, what is the probability the assembly line time will be

a.) 7 minutes or less?

b.) 10 minutes or less?

c.) between 7 and 10 minutes?

Please explain and Thank you so much!