SOLUTION: Best formula to understand probability and standard deviation

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Question 862287: Best formula to understand probability and standard deviation
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
*Note: z+=+blue%28x+-+mu%29%2Fblue%28sigma%29 population
*Note: z+=blue+%28x+-+mu%29%2Fblue%28sigma%2Fsqrt%28n%29%29 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