SOLUTION: The mean and standard deviation of 500 students who took a statistics final were 72 and 8, respectively. The grades have a mound-shape distribution. Based upon this information, th

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Question 1031582: The mean and standard deviation of 500 students who took a statistics final were 72 and 8, respectively. The grades have a mound-shape distribution. Based upon this information, the best estimate of the percentage of students who scored higher than 80 on the exam is

A 68%
B 32%
C 16%
D 5%
E 2.5%
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
C. 16%
Data within 1 standard dev comprise 68% by the empirical rule. Therefore the best estimate of the percentage of students who scored higher than 80 on the exam is
%28100+-+68%29%2F2+=+16%