Please help I’ll make you the brainiest

(40 points) i need some . an answer definition is appreciated as well.

Why do interests rates on loans to be lower in a weak economy than in a strong one

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?