一个大型挡风玻璃雨刷厂的经理，需要估计一下在一般驾驶条件下雨刷平均使用寿命的期望值有多大。
A large manufacturer of windshield wiper blades needs to estimate the mean life users of the blades can expect under typical driving conditions.
引擎和动力传动系统、刹车系统、底盘、外型、内部以及诸如灯、挡风玻璃雨刷和紧急刹车装置都是关键的组件和子组件。
Engines and drivetrains, braking systems, chassis, exterior, interior, and safety features like lights, windshield wipers, and emergency brakes were key components and subcomponents.
需考虑三种外部系统：雨刷器接口，挡风玻璃，和汽车电子系统。
Three external systems are considered: the wiper interface, the windshield, and the car electrical system.
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