SOLUTION: Approximately what percentage of the cases represented by the normal curve fall between-1 and 1 from the mean?

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Question 1159563: Approximately what percentage of the cases represented by the normal curve fall between-1 and 1 from the mean?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!

Approximately 68% of the standard normal distribution is between z = -1 and z = 1.

Put another way, roughly 68% of the normal distribution is within one standard deviation of the mean.

This is due to the Empirical Rule. Wikipedia has decided to call this the "68 - 95 - 99.7 rule" which is a fairly clunky name, in my opinion. Though perhaps some stats textbooks use this name to help students remember the three different percentages.