Please help me with this its math!!

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?

How can you find the mean absolute deviation (mad) for this set of data?

The graph shows how many words per minute two students read. drag to the table the unit rate that matches each graph.