Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.6. (Round

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answerhappygod
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Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.6. (Round

Post by answerhappygod »

Rockwell hardness of pins of a certain type is known to have a
mean value of 50 and a standard deviation of 1.6. (Round your
answers to four decimal places.)
(a) If the distribution is normal, what is the probability that
the sample mean hardness for a random sample of 12 pins is at least
51?
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