Are 7 27 47 and 67 all prime numbers

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (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 8 pins is at least 51?

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Find the missing factor. write your answer inexponential form.9^2=9^4×