(Solved): A manufacturing company measures the Rockwell hardness of their stainless steel parts. The mean ( ...

A manufacturing company measures the Rockwell hardness of their stainless steel parts. The mean (?) hardness of the parts is currently 70 with a standard deviation (o) of 2. a-) Determine the percentage of parts harder than 76 Rockwell hardness. b-) Determine the percentage of parts softer than 65 Rockwell hardness. c-) Draw the Normal Distribution Curve and place the values (76, 70= ?, and 65) on the curve. d-) Draw the Standard Normal Distribution Curve and place the corresponding z values (scores) on the curve, and show the regions that represents the percentages asked in part a-) and part b-). e-) If the quality engineer wants to collect the hardest 4% of all parts, what should be the minimum hardness of the parts to be collected?