Textbook ExpertVerified Tutor
20 Nov 2021
Given information
About what percent of 
values lie between the first and second standard deviations from the mean (both sides)?
Step-by-step explanation
Step 1.
In statistics, a normal distribution is a continuous variable with pdf
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
Solutions
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- Problem 51
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- Problem 53
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- Problem 55
- Problem 56
- Problem 57a
- Problem 57b
- Problem 58a
- Problem 58b
- Problem 59a
- Problem 59b