The mean score of a competency test is 77​, with a standard deviation of 4. Use the empirical rule to find the percentage of scores between 65 and 89 ​(Assume the data set has a​ bell-shaped distribution.)   A. 68​%   B. 99.7​%   C. 95​%   D. ​50%

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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The mean score of a competency test is

77​,

with a standard deviation of

4.

Use the empirical rule to find the percentage of scores between

65

and

89

​(Assume the data set has a​ bell-shaped distribution.)

 
A.
68​%
 
B.
99.7​%
 
C.
95​%
 
D.
​50%
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