What is equivalent to 90/100

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 2

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?

Acylinder has volume 45π and radius 3. what is it’s height?