NORMAL MODEL:

Standard Dev’s from mean Normal case ANY case +/- 1 Approx 68% 0%-100% +/- 2 Approx 95% 75%-100% +/- 3 Approx 99.7% 88.8%-100% How to use the z-table for any normal X: Let X be normal with mean and standard deviation . As an example consider a test with a mean of 55 and a standard deviation of 10 and a normal shape to the scores. ................
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