Is 5/7 greater than or less than 2/8

Answer this question, only if you know the answer. 30 points and brainliest!

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?

Which of the following is true for the relation f(x)=2x^2+1