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2. ACME produces ball bearings. The manufacturing process is designed so that the diameters follow a bell-shaped distribution with a mean of 30 mm and
2. ACME produces ball bearings. The manufacturing process is designed so that the diameters follow a bell-shaped distribution with a mean of 30 mm and a standard deviation of 0.15 mm.
(a) What percent of ball bearings have a diameter between 29.85 mm and 30.30 mm?
(b) What percent of ball bearings have a diameter less than 29.55 mm?
(c) What percent of ball bearings have a diameter between 29.70 mm and 30.45 mm?
(d) What is the cutoff for the longest 16% of diameters?
(e) What is the cutoff for the shortest 2.5% of diameters?
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