Arby’s advertisers $5 for 3 beef and cheddar sandwiches. how much is this per sandwich?

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?

10 ! in a race, nick is 50 feet in front of jay after ten seconds. how fast can nick run, if jay can run 20 feet per second?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?