6. To run without causing damage, diameters of engine crankshafts for a certain car model must fall between 223.92 mm and 224.08 mm. Crankshaft diameters are normally distributed, with a mean of 224- mm and a standard deviation of (1.03 mm. What percent of these crankshafts are likely to cause damage? 7. The daily discharge of lead 'om a mine's tailings is normally distributed, with a mean level of 27 mg/L and a standard deviation of 14 mgfL. On what proportion of days will the daily discharge exceed 50 mgfL