0.8% is what number of 6?

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?

Afootball is throw by a quarterback to a receiver

Awasher and a dryer cost $701 combined. the washer costs $51 more than the dryer. what is the cost of the dryer?