What is 2 times -3+ 1 inside absolute value

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?

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?