Ummm just an hour to Christmas Eve yeah

Which function is represented by the graph

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?

Prove that (x-2)is factor of p (x)=2x³-3x²-17x+30