The Scores on an Economics Examination Are Normally Distributed with a Mean

Multiple Choice

The scores on an Economics examination are normally distributed with a mean of 74 and a standard deviation of 11. If the instructor assigns a grade of A to 10% of the class, what is the lowest score (rounded to the nearest integer) a student may have and still obtain an A?

A) 86
B) 82
C) 89
D) 71
E) 80