Design FMEA has been applied to a new ignition switch for the company's line of riding lawn

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Design FMEA has been applied to a new ignition switch for the company's line of riding lawn mowers. It has concluded that failure severity (S) is 4 probability of occurrence (O) is 6 probability of detection (D) is 8.
a. What is the Risk Priority Number (RPN)?
b. Is that better or worse than the RPN of 144 of their old switch?
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