Finding Percentiles for a Normal Distribution

[@abbeyreeder5534]

god bless u sir. this video brought me back from sobbing over a goddamn math problem. i love you

[@crowsmathclass]

Glad it helped. Good luck in your class.

[@EthanHillis]

Studying for my statistics mid term and this helped me so much. Thank you

[@crowsmathclass]

You’re welcome. Good luck on your mid term.

[@EthanHillis]

@@crowsmathclass 🙏🏽

[@josephcox8156]

I am currently studying for my second midterm. Thanks a lot for the videos. You explained this way better than my professor does.

[@crowsmathclass]

You’re welcome. Good luck on your midterm.

[@mooncakes_1913]

I was panicking about my upcoming stats exam but now I feel more confident after watching your video! Thank you, you're a life saver :)

[@crowsmathclass]

You’re welcome. Glad it helped.

[@9zminnv]

Missed one day of Statistics and I was completely lost. This video helped a LOT, big thanks!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@bloatedninja]

This video is exactly what I needed! So easy to follow. Thanks so much!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@lunakhlo]

I’m still confused

[@Sparkle352]

Same

[@Badboije2117]

Twins😍😍😍

[@Hitesh-xy1ry]

Same here

[@taz2al]

Thank you so much Professor!!!! You truly made me love statistics!! Love from NYC!!

[@crowsmathclass]

You’re welcome.

[@tribaldeni]

is it possible to do this without the table?

[@crowsmathclass]

You can use software. Excel or Google Sheets does a good job

[@michellemcdonald7008]

Thank you SO MUCH! I was confused and your videos cleared this up for me! I can't tell you how much I appreciate it!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@chloeessen9152]

you are such a king for this video! All hail Steve Crow!

[@crowsmathclass]

Thank you. Glad it helped.

[@vrforyou3985]

thank you so much! You just saved my finals!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@kalebmckissick5056]

Great Video!! Thank you for going to so much detail it was really helpful!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@danieladimitrova5636]

Exactly what I need, thank you so much. You videos are very helpful, thank you

[@crowsmathclass]

You’re welcome. Glad it helped.

[@tejrey]

Brilliant!!!! This was very helpful, God Bless Sir.

[@crowsmathclass]

Thank you. Glad it helped.

[@Deaa-uf8zs]

What is the (Z) for 84 percentile ??

[@hayleejordan8339]

Thanks steve, you taught me more in 15 mins than my teacher has taught me in 2 weeks! ✨

[@crowsmathclass]

You’re welcome. Glad it helped.

[@palpol7753]

Omyghoshhhhhhh thanks for explaining you're the one here on youtube that solves for percentile thingy given only the sd and the mean that I understand, thank you so much for your effort!💕💕😍 Please keep teaching sir! Hands down to you sir 👐

[@crowsmathclass]

You’re welcome. Glad it helped.

[@_divya.348]

In the last part, -1.96 corresponds to 0.250 hence we’ll take -1.96 as Z value Thanks for the amazing vid!

[@crowsmathclass]

You’re welcome.

[@zachazuki]

Thank u, u saved me from suffering. New sub!!

[@crowsmathclass]

Thank you.

[@bhoxzivanlangnamanpfhoe7869]

are you a cowboy

[@avery9457]

I know this is from three years ago but this made me laugh

[@maryh2966]

😂😂😂

[@user-sr7er6zu4q]

Really great video!this explained every question I had! Thank you 😇✌️

[@crowsmathclass]

Thank you. Glad it helped.

[@RekiaBrown]

I'm currently studying for my final exam in statistics and this video was everything I need and more. HaHa! thank you so much!

[@crowsmathclass]

You’re welcome. Good luck on your final.

[@aparna4413]

Thank you so much for this video!

[@crowsmathclass]

You’re welcome.

[@vianeyv4865]

Thank you Mr.Crow

[@crowsmathclass]

You’re welcome.

[@gregvanriper795]

Hi Steve, I sure appreciate your time and expertise in statistical information and teaching. I am wondering if you could help me solve a problem. I received a test result for a chemical called 1-bromopropane. The LLOC is 4.0 The 75th percentile is 11 The 95th percentile is 46 My level is at 72. Would this be considered as high or not? Is there a way that I can calculate what percentile it is at based on the limited information that I have?

[@patsymalpica6010]

I’m having a similar issue

[@nub2370]

Today's my midterm and i forgotthe lessons lol so i came here. Thank you so much!!

[@crowsmathclass]

You’re welcome. Good luck on your midterm.

[@selamawittaye3034]

you saved my life sir thank you !!!!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@mathhelpmadeeasy]

I loved the way you explained it. Thank you!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@HANZu.y]

Wow,I got what I want from this video.thanks

[@crowsmathclass]

You’re welcome. Glad it helped.

[@luciehepworth6669]

This video has helped me so much, thank you.

[@crowsmathclass]

You’re welcome. Glad it helped.

[@johnpierce6383]

I didn't know which number to use on the Z-table when it was between 2 values and not exact. Thanks for the help!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@hishamhani3497]

Big thanks from Kingdom of Jordan 🙏

[@crowsmathclass]

You’re welcome.

[@williamb7574]

Is there a way to get the table on pdf?

[@crowsmathclass]

I have not looked but I’m sure there is a pdf on the internet.

[@MMMTAL]

omg, finally I found the solution, thank you so much.

[@crowsmathclass]

You’re welcome.

[@keepinupwithkeny6302]

Why do need to multiply by 5 ?

[@Shhhaikha]

To solve for X

[@Menoman07]

excuse me sir but there is a definite value for 0.25. it is located in -1.96. I was wondering whether this was a slight oversight in your end or there is another explanation regarding this as there are 2 possible places we can find the 25th percentile. The one in -1.96 and the one you chose

[@computerscience-qo1tt]

Why do we look for negative z value in case of 25th percentile and positive z values for 97.5 and 95 percentile?

[@crowsmathclass]

We are on the left side of zero. Those are negative z values.

[@Mikeyzilla13]

Thank you so much! This was very helpful!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@SpiderLily-pt6rs]

It does help thank you so much😊

[@crowsmathclass]

You’re welcome

[@nailahunxai4194]

Sir why we choose 1.28 in 90th percentile instead of 1.29 coz there was already 90 its self then why 😢

[@blackkatkid]

Thanks Steve!

[@crowsmathclass]

You’re welcome.

[@mrbeans6405]

how do you work out sigma and mean from only having values of area and Z value?!?

[@haraldriisager8594]

Do you also have the x values? If you do, just use z=(x-mean)/sigma for 2 different z and corresponding x values, and then just use a system of equations to solve for the mean and sigma.

[@alexandersmith7221]

Thank you for saving my stats grade!!!

[@crowsmathclass]

You’re welcome.

[@denismunene5399]

Where is the table extracted from,,,, i want to solve a similar question

[@crowsmathclass]

I think I scanned it from a book. You can also google z table and print one out.

[@jaspertrilles7111]

Thank you very much Sir! 😊

[@crowsmathclass]

You’re welcome.

[@YasirFatemi]

Thank you so much sir , it was really helpful.

[@crowsmathclass]

You’re welcome. Glad it helped.

[@kelvinfumo4576]

What if we don't have the chart?? How do we find it

[@crowsmathclass]

You would have to use excel.

[@kelvinfumo4576]

@@crowsmathclass I use R studio

[@kelvinfumo4576]

How can I find it?

[@crowsmathclass]

I have never used R. Sorry about that.

[@haraldriisager8594]

you can use the invnorm function on your calculator

[@boazkipruto3274]

Thank you for such a nice explanation.

[@crowsmathclass]

You’re welcome. Glad it helped.

[@stuffido1536]

I'm cramming cuz my exams is 4 hours away lol, thanks a lot

[@reynallendaulong4666]

Hi, can you please drop the link of that z table?? huhuh great help!

[@rooneymaitha7839]

You're amazing.

[@crowsmathclass]

Thank you.

[@chrisclements3862]

awesmmmmm. any quick ways of figuring out my left from right? im using stat crunch and i dont know when i should use greater than or less than. thanks.

[@crowsmathclass]

The problems usually say greater than or less than. Or they will say above or below.

[@chrisclements3862]

Assume the random variable X is normally distributed with mean 50 and standard deviation 7. Find the 78th percentile. I figured it out to be the percentile is 55.41 I had to guess at greater than or less than. Any advice?

[@SHAIKARSHAD-p7p]

thank you sir love from india

[@crowsmathclass]

You’re welcome

[@RohanKhubchandani]

wouldn't it be -0.53?

[@alexsomerville5036]

Thank you so much

[@Jackiesworld1]

Thank you very helpful

[@crowsmathclass]

You’re welcome.

[@Ash-uq9jh]

For the 25th Percentile, the z score is -1.96 (0.250). The answer would be -1.96(5)+63=53.2 z score*standard deviation+mean

[@lrichu21]

Thank you Sir👍

[@crowsmathclass]

You’re welcome

[@rajneesh9860]

You cleared my z score doubt thanks

[@crowsmathclass]

You’re welcome.

[@crowsmathclass]

You’re welcome.

[@sujanbhakat1199]

Thank you.

[@crowsmathclass]

You’re welcome.

[@wanderingeldest5627]

Thank you 🙏

[@crowsmathclass]

You’re welcome.

[@redeemerarcher5309]

The standard normal (Z) table I have here is really different from yours completely.

[@crowsmathclass]

Yea. The one I’m using is more common. I don’t really care for the other one.

[@willsee01]

youre my hero

[@crowsmathclass]

Glad it helped.

[@fVNzO]

You have a very strange accent, where are you from? Sounds very old western action movie esque.

[@crowsmathclass]

Louisiana.

[@itsross577]

I thought the answer in percentile is in the table?

[@ailanyt.7368]

Ahh these things itch my brain.

[@sahabzadabilalomer7828]

You are the best

[@crowsmathclass]

Thank you. Glad it helped.

[@lav3399]

thanksss

[@crowsmathclass]

You’re welcome.

[@50gs76]

Thanks 🙏

[@crowsmathclass]

You’re welcome.

[@michellekayange2136]

Thank you

[@Mzing_Anonymous]

Very helpful

[@crowsmathclass]

Thank you. Glad it helped.

[@kenanmz8186]

Wawww that was 👍 great

[@crowsmathclass]

Thank you.

[@wannursyaziyah5489]

Thank you sir :)

[@crowsmathclass]

You’re welcome.

[@hibakhawatmi2524]

thanks sir!

[@crowsmathclass]

You’re welcome.

[@varliahmet]

Thanks a lot

[@crowsmathclass]

You’re welcome.

[@michealclarke22]

South Park?

[@sumayatabassum7042]

Your accent is nice

[@crowsmathclass]

Thank you.

[@fmartinez004]

Thank you but you have to much noise in your mic

[@crowsmathclass]

You’re welcome.

[@hilmikhatib6601]

Thanks

[@crowsmathclass]

You’re welcome.

[@ProGoYouTube]

i love you

[@crowsmathclass]

Glad it helped.

[@Emmmarogerss]

THANKCYOU

[@crowsmathclass]

You’re welcome.

[@humblemuslimah8402]

why u sound like ice cube!! damn

[@crowsmathclass]

Ha. Never heard that before.

[@mariasierra4201]

lol you sound like Theo Von

[@crowsmathclass]

👍

[@joey3070]

zeerow

[@frezylgomez6437]

Yawa

[@jcheloreal655]

D na nakakatuwa adsss nyu youtube

[@lonewolf345]

L explainaition

[@vevobob7945]

this was so helpful. thank you so much!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@zinahal-khateeb2952]

Thank you so much

[@crowsmathclass]

You’re welcome.