Question 1032019
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
------
(80-72)/8 = 1
That means a score of 80 is one standard deviation above the mean>
-------------------
Since 68% of the data is within 1 standard deviation of the mean,
34% is within 1 std to the right of the mean.
So 50% - 34% = 16% of the scores are higher than 80
------------
Cheers,
Stan H.
--------------
A	68%
B	32%
C	16%
D	5%
E       2.5%