What is the least amount they could have spend

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?

Select the graph of the solution. click until the correct graph appears. |x| = 3

Which of the following best describes the figure?