How do you make ONE disappear? I will be adding more jokes every day. Look out in every subject to see if you can answer them!

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?

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).

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