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For every positive 2-digit number, x, with tens digit t and units digit u, let y be the 2-digit number formed by reversing the digits of x. Which of the followingexpressions is equivalent to x β y ?a) 9(t β u) b) 9(u β t) c) 9t β u d) 9u β t e) 0
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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 1.1. (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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For every positive 2-digit number, x, with tens digit t and units digit u, let y be the 2-digit numb...
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