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22 April, 08:13

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.2. (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 16 pins is at least 51

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  1. 22 April, 12:10
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    I really dont know, sorry
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