Hi  

A. What z score divides the normal curve exactly in half? 0 

(x-value = mean at that point) 

B. What % of the area lies in each half of the curve? 50%

C. What % does the whole curve add up to? 100%



Here is a normal distribution curve / various standard deviations:



For the normal distribution: 

one  standard deviation from the mean accounts for about 68.2% of the set 

two standard deviations from the mean account for about 95.4%

and three standard deviations from the mean account for about 99.7%.

 

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