Data have been collected on the cycles to failure of a certa

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 cell interval 50 cycles Compute the values of X and s for this distribution, what prpportion of the product meets a minimum specifiction of 400 cycles? Compute the values of X and s for the distribution. If this process is assumed to generate a normal distribution, what proportion of the product meets a minimum specification of 4(H) cycles?

Solution

mean = 200 / 575 = 0.3478

S = Srqt (200/575-1) - 0.3478^2

S = 0.4693