Eldon received 72 on his first calculus test. The marks were normally distributed with a mean of 60 and a standard deviation of 8. He received 80 on the next test, which was normally distributed with a mean of 75 and a standard deviation of 6. Which was the better mark, relatively speaking?

Answer 1

z value of 1st test = [72-60]/8 = +1.5
z value of 2nd test = [80-75]/6 = +0.83
Thus the 1st test mark is better
is this right ??