Mathematics Applications and Interpretation for the IB diploma - Ibrahim Wazir, Tim Garry, Kevin Frederick, Bryan Landman

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The life span of a calculator manufactured by a major company 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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