The international standard for transportation of perishable foodstuffs requires that the heat transfer rate (H = k/t) through the insulated walls of a refrigerated container does not exceed 0.4 Watts/m2-°C. If the thermal conductivity k of the insulating material is known to be normally distributed with a mean value of 0.35 Watts/m-°C and a standard deviation of 0.02 Watts/m-°C, what insulation thickness f is required to ensure that there is a 99.5% probability that the standard is met?
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