ck12.org normal distribution problems: z-score | Probability and Statistics | Khan Academy

Z-score practice

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[berry.x]

"how many standart deviatons away from the mean"
this simple explanation was all i needed. my "proffessor" who has "worked on biostatistics for 30 years" tried to explain this to us for 25 mins and when she couldnt she accused us of not knowing any math. thank you for the video, khan academy

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[fnmav]

3:50 "Let's do a couple more, let's do all of em" Love the attitude ! :D

[rachelchu]

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[TriniSecularHumanist]

I cannot begin to thank you for simplifying what I have been doing in class for the past month! Thank you for explaining what z-squared means!!! We were taught how to calculate but not what it means. I just experienced multiple epiphanies. Thank you so much for sharing your knowledge online for free! The world is a better place for it!

[praptiadhikari]

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and appreciated by everyone
classroom lectures make us yawn
all we wanna say is thank you Khan

[WhatIsThatBlueStuff]

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[nubianmaat]

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[scottparsons]

Once again you have taken a concept that was presented in a confusing manner in my book and made it ridiculously simple! Thanks!

[sofiapraderio]

I watched countless videos about this and this one was the one that truly made me understand this perfectly. thank you SO much!!!

[MiguelBandito]

Thanks Professor.. You made this so simple.

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[QuillWorks]

0:22
My ears: “A mean of 81”
My head: “A mu of 81”

[greymollusk]

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All Hail Khan!

[sampleaccount]

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[TheMunkzilla]

Thank you. This finally makes sense. Textbooks over complicate things and when taking statistics courses online with no actual classtime this is a lifesaver!