Ahumanities professor assigns letter grades on a test according to the following scheme.
a: top 8%8% of scores
b: scores below the top 8%8% and above the bottom 62%62%
c: scores below the top 38%38% and above the bottom 18%18%
d: scores below the top 82%82% and above the bottom 9%9%
f: bottom 9%9% of scores scores on the test are normally distributed with a mean of 6767 and a standard deviation of 7.37.3. find the numerical limits for a c grade. round your answers to the nearest whole number, if necessary.