ck12.org: More Empirical Rule and Z-score practice

[Samantha110882]

Sal Khan has explained the concept using an open content source, CK12.org which is a non profit . CK12 provides educational content for K12 students in form of flexbooks which can be customized as per need, these are also available for download. I found it extremely beneficial to study using these as I could create a textbook that suits my needs.

[zippo929]

this is so helpful! thank you!

[JLchevz]

Salman khan, thank you for all the A's and 10's, and all the knowledge you have given us

[paulceltics]

im gonna get a 5 cuz of khan

[coolslaya]

I LOVE YOU MAN!

[Dark1Masta]

Thanks, you're a life saver !

[biozamadotcom]

good video.

Statistics.

[Jakers2009]

its not that bad...

[Rayman304]

Don't add stupid comments saying "first" on the khan academy videos. I think Mr. Khan and his videos are far better than having to put up with ignorant people feeling the need to post a comment saying that they are the first person to comment on a particular video. Actually, 1 word does not a comment make, so saying "first" in a comment isn't really a comment, so your contradicting yourself.

SO STOP IT!!