Plzz im in the need of look in the picture answer all 3 pl

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?

What is the number 321,000,000 in scientific notation? also what is the number? ?

Is the figure congruent? yes or no?