If a sample proportion is 0.85, which range of possible values best describes an estimate for the population parameter? A. (0.8,0.89) B. (0.85,0.9) C. (0.8,0.9) D. (0.8,0.85)

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?

Given that abcd is a rhombus, what is the value of x?

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?