with a mean score of 81 and a standard deviation of 12. Draw a sketch of a normal distribution centered at the mean of 81 and divide it into 5...

with a mean score of 81 and a standard deviation of 12. Draw a sketch of a normal distribution centered at the mean of 81 and divide it into 5 regions based on the following grades:The top 10% of scores receive an AThe next 20% of scores receive a BThe middle 40% of scores receive a CThe next 20% of scores receive a DThe bottom 10% of scores receive an F