Students very often ask their professors whether they will be curving the grades. The traditional interpretation of

Students very often ask their professors whether they will be €œcurving the grades.€ The traditional interpretation of €œcurving grades€ required that the grades have a normal distribution, and that the grades will be assigned in these proportions:

a. If the average €œC€ grade is centered at the average grade for all students, and if we assume that the grades are normally distributed, how many standard deviations on either side of the mean will constitute the €œC€ grades?

b. How many deviations on either side of the mean will be the cutoff points for the €œB€ and €œD€ grades?

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Letter Grade A Proportion of Students 20% 40% 10% 20% 10%