document.write( "Question 862287: Best formula to understand probability and standard deviation \n" ); document.write( "
Algebra.Com's Answer #519582 by ewatrrr(24785)\"\" \"About 
You can put this solution on YOUR website!
*Note: \"z+=+blue%28x+-+mu%29%2Fblue%28sigma%29\" population
\n" ); document.write( "*Note: \"z+=blue+%28x+-+mu%29%2Fblue%28sigma%2Fsqrt%28n%29%29\" sample size n (knowing population SD)
\n" ); document.write( "and to understand these z-values represent the area under the standard normal curve to the left of the z-value
\n" ); document.write( "Below: z = 0, z = ± 1, z= ±2 , z= ±3 are plotted.
\n" ); document.write( "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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