Question: The Rockwell hardness of specimens of an alloy shipped by your supplier varies according to a normal distribution with mean 70 and standard deviation 3.

The Rockwell hardness of specimens of an alloy shipped by your supplier varies according to a normal distribution with mean 70 and standard deviation 3. Specimens are acceptable for machining only if their hardness is greater than 65. What percentage of specimens will be acceptable? Explain

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