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A remote control has three main components: a joystick with a mean time to failure (MTTF) of 237 hours, a computer chip with an MTTF

A remote control has three main components: a joystick with a mean time to failure (MTTF) of 237 hours, a computer chip with an MTTF of 393 hours, and a transmitter with an MTTF of 361 hours. The reliability for each of these components is described by exponential distributions and each is independent of the other. What is the MTTF of the system? (Answer to the nearest hour)

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