Free points whoever is reporting this just stay mad :) like i could truly care less if u report this just know that ur not helping and im being kind enough to give out points so stop. and grow t-f up.

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?

Simplify the expression. -2/5(10+15m-20n)

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9