How does the last paragraph wrap up the article?

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?

Which statements regarding efg are true? check all that apply.

If a is a nonzero real number then the reciprocal of a is