不 Lifetimes of electronic components can often be modeled by an exponential model. Suppose quality control engineers want to model the lifetime of a hard drive to have a mean lifetime of 4 years. Complete parts a and b below. a) What value of should they use? They should use a value of for λ. 4 (Type an integer or a fraction.) b) With this model, what would the probability be that a hard drive lasts 8 years or less? The probability is (Type an integer or a decimal. Round to three decimal places as needed.)

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