Please answer the following..

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?

Tom drove 206 miles in 3.9 hours. estimate his average speed.

Will give a: 122 b: 90 c: 48 d: 180