# The Normal Distribution and the 68-95-99.7 Rule

The Normal Distribution and the 68-95-99.7 Rule. In this video, I talk about the normal distribution and what percentage of observed values fall within either 1, 2, or 3 standard deviations from the mean. One specific example is discussed. For more free math video, visit http://PatrickJMT.com

Great video saved my ass

would a score of say 120 be 1 or 2 standard deviations away? do you go by lines or by sections?

Thank you for the video

Its very helpful

Thank you! This was so helpful!

THANK YOU SO MUCH!!!!

Thanks dude!!

Excellent explanation! Now if the question was: What percentage had an IQ between 115 and 55? How would you go about solving that?

Thats fantastic buddy, thank you. Quick question – so lets say in your example Z scores is coming 1.8, which means 1.8 standard deviation above/below the mean. But how would we put this into confidence interval ? For instance, i know 1 SD means 68%, 2 SD means 95%….but how would we put 1.8 SD into a confidence interval ?

Thank you!! This was very helpful.

Why does not 100% of the data always fall within 3 standard deviations of the mean?

thanks

man you are good!!! thankyou so much:)

What's your IQ patrick

Good One — Thank YOu Very much

nice thanks

Thank you that was very helpfull:)))))

This makes no sense at all, you don't even have a data set to work with.

OMG!!!! I UNDERSTAND IT!!!

HE EXPLAINED SO DAMN WELL!!!!!

Thanks so much for this easy explanation!