corey has $89 to go shopping. T-shirts cost 12.50 each. Corey wants to busy some t-shirts and have at least $14.00 for lunch. Which models represented all possible numbers of t-shirts , x, Corey can buy?

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?