# z-score Calculations & Percentiles in a Normal Distribution

I show you how to calculate Z-scores and find areas under the bell curve…p-values. I will also show you how to find statistics from areas under the curve…such as quartiles.

You can find p-values with a calculator as well. This is what it looks like on a TI-NSPIRE
TI-NSPIRE Z score to Pval & Pval to Zscore NormCDF invNorm

Check out http://www.ProfRobBob.com, there you will find my lessons organized by class/subject and then by topics within each class. Find free review test, useful notes and more at http://www.mathplane.com

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13 replies
1. Anthony Le says:

How can I find the percentile if they give me only the standard deviation? I got stuck only for this for the home test. thanks million of getting your response as soon as possible

2. niun10 says:

Informative and funny! Thanks for the help Professor Rob!

3. Jose Perez says:

Bro you totally saved my life!!!! THANK YOU SOOO MUCH!!!

4. Leonard Jonas says:

Great Prof. I salute this man. Now I can sleep with ease and at peace. Thump up!!!!!!!!!!!!

5. S.T Tan says:

Thank you!!

6. Andy Bryte says:

how do I use z score to calculate a variable: eg, I have a z score of 1, a mean of 33,266, and a standard deviation of 22,333… how do I apply this information to figure out what the actual variable is that's represented by this z score

7. Bobby Williams says:

I am taking a stat class for a graduate education degree and as a history teacher, math has never been my strongest subject. Thank you for these videos. From one Bob to another.

8. Manasi Ponamala says:

you mentioned that if a problem says the data is normal it will follow with asking for z score but is there a possibility they might ask for t score or should i just assume it's asking for z score? For the frqs on the ap exam

9. Christian Dave B. Balatico Balatico says:

nice entree SIR hehehe

10. Anna O says:

You saved my life, and my exam score; which is in 30 min minutes … God bless your soul

11. Eza Mariel Wong says:

i love how enthusiastic he is lol

12. elizandra cruz says:

He is too fast… nope ty