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Rockwell hardness of pins of a certain type is known to have a mean value...

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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 3 Round your answers to four decimal places LUSE SALT a If the distribution is normal what is the probability that the sample mean hardness for a random sample of 16 pins is at least 51 b What is the approximate probability that the sample mean hardness for a random sample of 37 pins is at least 51 You may need to use the appropriate table in the Appendix of Tables to answer this question

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