Need to understand range

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?

What other information do you need to prove triangle dac=bca by asa

Is it greater than or less than7*3_9*2