fit in the casing? (a) Determine the mean and standard deviation of the difference between the width of the casing and the width of the door. Mean=___________. Standard deviation=__________. The width of a cosina for a door is normally distributed with a mean of 24 inches and a standard deviation of 1/8 inch. The width of a door is normally distributed with a mean of 23 and 7/6 inches and a standard deviation of 1/16 inch. Assume independence. Round your answers to three decimal places (e.a. 98. 765).

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