(80a)^3/4 in radical form

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?

For each proportion find the unknown number x 1/5/8=×/15

The table represents a function. what is f(-2)? a.-3 b. -1 c.1 d.3