Acompany buys printer paper in a box which contains 8 packages. if each package of paper cost 3 dollars how much does a box of paper cost.

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?