What is the domain of the function

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?

When only separate discreet points are graphed it is called?

There are 93 calories in a small candy bar how many calories are ther in a half dozen small candy bars?