39,545 rounded to the nearest thousand

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?

Need on this geometry question. explain how you did it.

What is the relationship between all triangles that can be drawn given the same three angles