Maurice Tutor

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Category > Management Posted 10 Oct 2017 My Price 4.00

Rockwell hardness of a metal

The Rockwell hardness of a metal specimep is determined by impressing the surface of the specimen with a hardened point and then measuring the depth of penetration The hardness of a certain alloy is normally distributed with mean of 70 units and standard deviation of 3 units.

(a) Ifa specimen is acceptable only if its hardness is between 66 and 74 units, what is the probability that a randomly chosen specimen is acceptable?

(b) If the acceptable range is 70 ± c, for what value of c would 95% of all specimens be acceptable?

 

 

Answers

Maurice Tutor
(5)
Status NEW Posted 10 Oct 2017 09:10 PM My Price 4.00

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