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０问题的提出一件产品由若干零件组装而成，标志产品性能的某个参数取决于这些零件的参数．零件参数包括标定值和容差两部分．进行成批生产时，标定值表示一批零件该参数的平均值，容差则是偏离其标定值的容许范围，若将零件参数视为随机变量，则标定值代表期望值，在生产部门?
0 PROBLEM PROBLEMS A product is assembled from several parts and one of the parameters that characterize the performance of the product depends on the parameters of those parts. Part parameters include the calibration value and tolerance of two parts. For batch production, the calibration value represents the average of the parameters of a batch of parts, the tolerance is deviating from the allowable range of the calibration value. If the part parameters are regarded as random variables, the calibration value represents the expected value. In the production department?