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Category > Management Posted 21 Oct 2017 My Price 2.00

Rockwell hardness

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.2.

a. If the distribution is normal, what is the probability that the sample mean hardness for a random sample of 9 pins is at least 51?

b. Without assuming population normality, what is the (approximate) probability that the sample mean hardness for a random sample of 40 pins is at least 51?

 

 

 
 

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Maurice Tutor
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Status NEW Posted 21 Oct 2017 03:10 PM My Price 2.00

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