Data have been collected on the cycles to failure of a certain relay device. The so-called short method has been used to develop the following information. The origin is at 575 cycles, and the cell interval is 50 cycles η – Σ/ = 200 Σ/d =-63 fd = 1,795 (a) Compute the values of Xands for this distribution.
(b) If this process is assumed to generate a normal distribution, what proportion of the product meets a minimum specification of 400 cycles?