over the range of cylindrical parts manufactured on a computer-controlled lathe, the standard deviation of the diameters is 0.002 millimeter/
(a) what does Chebyshe's theorem tell us about the probability that a new part will be within 0.006 units of the mean μ for that run.
(b) If the 400 parts are made during the run, about what proportion do you expect will lie in the interval in Part a ?