Please give a "thumbs up" for the answer , in case you're satisfied with the answer.
9.
Mean = 78.3
Stdev = 3.8
A and B have 68% of all final paper scores. 68% is 1 deviation from mean.
So, A and B are 78.3-3.8 and 78.3+3.8 respectively.
A = 78-3.8 = 74.2
B = 78+3.8 = 81.8
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