SOLUTION: Over what grade should we find the 10 best students out of 37 in a test with a average of 82 and a standard deviation of 5?

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Question 847574: Over what grade should we find the 10 best students out of 37 in a test with a average of 82 and a standard deviation of 5?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

m= 82, sd = 10, n = 37 (top 10)   0r top 27 percentile

Normsinv(.135) =  z = 1.102 = (x - 81)/7

    .6128 = (x - 82)/10

     6.128 + 82 = 88.128   Over an 89 test score