The mean score of a competency test is 71​, with a standard deviation of 5. Use the empirical rule to find the percentage of scores between 61 and 81. ​(Assume the data set has a​ bell-shaped distribution.)   A. 68​%   B. 99.7​%   C. ​50%   D. 95​%

MATLAB: An Introduction with Applications
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Chapter1: Starting With Matlab
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The mean score of a competency test is
71​,
with a standard deviation of
5.
Use the empirical rule to find the percentage of scores between
61
and
81.
​(Assume the data set has a​ bell-shaped distribution.)
 
A.
68​%
 
B.
99.7​%
 
C.
​50%
 
D.
95​%
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