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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Calculating Probabilities for the Normal Distribution

There are a couple of approaches to calculate probabilities for a normal random variable. The following example demonstrates how this is done.
 
One morning a few days ago, Debbie called me on my cell phone while I was out running errands and spoke the two words that I had feared hearing for the past year. “They’re back,” she said. “Okay,” I replied somberly, and then hung up the phone and headed straight toward the hardware store. My manhood was once again being challenged, and I’d be darned if I was going to take this lying down. This was war, and I was coming home fully prepared for battle! I am referring to, of course, my annual struggle with the most vile, the most dastardly, the ...

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