SOLUTION: An analysis of the grades on the first test in French revealed that they approximate a normal curve with a mean of 75 and a standard deviation of 8. The instructor wants to award t

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Question 1177231: An analysis of the grades on the first test in French revealed that they approximate a normal curve with a mean of 75 and a standard deviation of 8. The instructor wants to award the grade of A to the upper 10% of the test grades. What is the dividing point between an A and a B grade?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
z= invNorm(.10) = 1.282
1.282 = (x-75)/8
 x = 85.256  

 the dividing point between an A and a B grade is 85


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