Suppose the life span of a calculator manufactured by Texas Instruments has a normal distribution with a mean of 54 months and a standard deviation of 8 months. The company guarantees that any calculator that starts malfunctioning within 36 months of the purchase will be replaced by a new one. About what percentage of calculators made by this company are expected to be replaced?

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A: ∫ -∞∞f(x)=1⇒∫ -∞0f(x) + ∫0∞f(x)⇒∫ -∞00 + ∫0∞8e-8x⇒8e-8x-80∞⇒-e-∞-e0⇒-e∞≠1 this is not a pdf

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