The rockwell hardness of a metal is determined by
impressing a hardened point into the s...
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Mathematics, 31.10.2019 00:31 miwptv105own5u8
The rockwell hardness of a metal is determined by
impressing a hardened point into the surface of the
metal and then measuring the depth of penetration of the
point. suppose the rockwell hardness of a particular
alloy is normally distributed with mean 70 and standard
deviation 3. (rockwell hardness is measured on a continuous
scale.)
a. if a specimen is acceptable only if its hardness is
between 67 and 75, what is the probability that a randomly
chosen specimen has an acceptable hardness?
b. if the acceptable range of hardness is (70-c, 70+c) ,
for what value of c would 95% of all specimens have
acceptable hardness?
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