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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?

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?