Question #191078

The average grade for an exam is 74, and the standard deviation is 7. If 12% of the class is given grade A, and the grades are curved to follow a normal distribution, what is the lowest possible grade A?

Expert's answer

Standard Normal Distribution Table will be used to find the value of z for the required percentile. Supposed 12% of the class are to be awarded A's then z value is obtained at the 88th percentile from the Standard Normal Probability Table as follows .

0.8810 provides z= 1.18

then the neceresry score is obtained by setting

z=

x= the score to calculated

1.18=

x= ( rounded down)

x= 82 is the score required to receive an A.

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