Please help me solve this

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?

Adiverr from the university of florida women’s swimming and diving team is competing in the ncaa zone b championships

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x