Standard Deviation, Mean Absolute Deviation, Z Scores

Video Standard Deviation: https://www.youtube.com/watch?v=dq_D30kyR1A

More: https://www.youtube.com/watch?v=qqOyy_NjflU

More Explanations of Standard Dev: https://www.youtube.com/watch?v=dMpnHbLsA9I

M.A.D: https://www.youtube.com/watch?v=46NgNOrYW4U

Calculator Tricks MAD: http://mathbits.com/MathBits/TISection/Statistics1/MAD.html

Z Scores: https://www.youtube.com/watch?v=1o-t_mVDDYQ

Normal Distribution 68-95-99.7% Rule: https://www.youtube.com/watch?v=cgxPcdPbujI