Textbook ExpertVerified Tutor
19 Nov 2021
Given information
About what percent of the 
values from a normal distribution lie within two standard deviations (left and right) of the mean of that distribution?
Step-by-step explanation
Step 1.
A normal distribution is a continuous variable with pdf in statistics.
Where: 
is the mean of the distribution and 
is the standard deviation; notation 
. If 
the random variable is called the standard normal distribution.
In a normal distribution, the 
-score indicates how many standard deviations a given number is above or below the mean. The -negative score's value indicates that the value is below the mean, while the positive value indicates that it is above the mean.
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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208
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