Mathswatch nth term of a sequence

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?

If jaime wants to find 60% of 320, which table should he use?

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles