SOLUTION: Best formula to understand probability and standard deviation

Question 862287: Best formula to understand probability and standard deviation
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
*Note: population
*Note: sample size n (knowing population SD)
and to understand these z-values represent the area under the standard normal curve to the left of the z-value
Below: z = 0, z = � 1, z= �2 , z= �3 are plotted.
Note: z = 0 (x value the mean) 50% of the area under the curve is to the left and %50 to the right

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