Which two-dimensional figure is formed when a right rectangular pyramid is sliced by a plane through the pyramid's vertex and perpendicular to the pyramid's base?

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?

What are the exclude value of mn+3m

With finding limits of multi variable !