17 Equations that changed the world

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I get it, its a pretty hard sell to get people to buy a book about equations. But when you write a book called In Pursuit of the Unknown: 17 Equations That Changed the World, it might be a good idea to get the equations right. Math is hard, but it's not that hard. Chapter 7 covers the equation for the standard normal distribution. Here is the offending equation from page 107:
Also, it is repeated wrong on page 115:
There are lots of ways to write this equation, as far as being algebraically equivalent. However, what you see above is not it. Here is the corrected version.
Seriously, I teach this in high school. It's not that hard.


πday Preview

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I'm getting a πday investigation set up for my students to do on 3/14. I have circles of various that they will have to measure the diameters and circumferences (circumfrencii?)