Can someone help I’m confused?

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?

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

Which strategy is used by public health to reduce the incidence of food poisoning?