The manufacturer of a crankshaft company is interested in finding tho specification limits of its machining process. It is known that 12% of the hole diameters are made too 10 . A random sample of 25 parts inspected show that the sample mean and variance for hole dimeter are 42.35 and 1.47, respectively. What are the values of specification limits knowing that the tolerance limits are +-3.0 ? Assume nomal distribution.