What is the equivalent ration for 2/9

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?

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?