Provide the working outs as well as the answer. many

What graph correctly matches the equation y equals two negative x

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?

Indicate the formula for the following conditions: p^c(n,r)=