What is the probability of the stereo failing

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The lifetime of a new stereo is estimated to be 12 years with a standard deviation of 2.5 years. A. What is the probability of the stereo failing after 4 years? B. If there is a full replacement guarantee of 3.5 years, What is the expected proportion of replacements? C. If the firm is willing to replace up to 3%, What guarantee period should it specify? Please show your work

Reference no: EM131035590

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