Company determines that that the length of life of WPPX model radio is probably normal with µ=12 years and σ=2.5 year A) Lets say this radio company guarantees the radio for 9 years. What % of the radios will have to be replaced... find % of the radios that last less than 9 years? (b) Also lets say the radio company says they are going to replace the bottom 2.5% of the radios. What is thethe length of minimum guarantee period (c) What is the 90th percentile of the length of life of the radio model?

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