normalCDF & InvNorm on TI-84 Plus Calculator: Normal Calculations

This problem is from the following book: goo.gl/t9pfIj
We calculate areas on the standard normal curve and use areas to find cutoff values (z-scores). We do our calculations on a TI-84 Plus using the normalCDF & InvNorm functions.

[@theshillarious]

My mans got the density curve stamp if that's not a flex

[@ThungStudios]

fr he straight off the goop

[@PPHerman]

@@ThungStudios wilddd

[@hannahli6052]

Please I have been dying in Stats and you just taught me more in a few minutes than my teacher ever could. Actually a lifesaverrrrr

[@jameso.4381]

Fellow Stats students, the Casio Fx-CG50 lets you input the "Tail" in a LEFT, RIGHT, or CENTRAL position into its Inverse Norm function, giving you BOTH left and right values in ONE computation -
Ex:
Tail: Central,
Area: .7
Std Dev: 3.5
Mean: 200, Execute...
"X1 Inv = 196.3724"; "X2 Inv = 203.6275
Highly recommended!

[@thessianheart9816]

The TI-84 Plus CE Python does as well. This video is using an older TI.

[@BudEnzo]

Explains in 5 minutes what my teacher did in 3 days only easier.

[@Sadmoviesmekmecry]

Lol yep

[@brandonlamb3992]

This is the only person I have ever seen that can just casually do a math video about pygmy pregnancy.

[@rxysurfer11]

Im about to take an exam and you literally just saved my LIFE!

[@moistybrownboii]

lmao same my dude, Math studies FTW

[@duevil3303]

Some german student here. I've my final examination at school tomorrow and never fully understood the invNorm-command, but thanks to you I think that I now do

[@quaidsutherland2060]

Great video! I'm studying for an exam and I've been going through youtube and I swear this was the most clear and helpful one. You also jumped straight into contend without any "hi my name is ___ and today we'll be...." which was super nice. Thanks for the help!

[@sunseyaki9704]

you da bomb man. saved me for my AP stats final

[@RainbowlollitheBicheamirite]

this 3 year-old video just saved my grade, thank you !!

[@AnTran-cc1ej]

where can I get that stamp!?!

[@MATHRoberg]

The stamp will be available in about a month on Amazon. :)

[@MATHRoberg]

I finally have an answer for where to get the Normal Distribution Rubber Stamp: goo.gl/EJkTP2
Please help spread the word.

[@AnTran-cc1ej]

thanks! my teacher would love this :))

[@pa_u_los]

@@MATHRoberg Where can I get this stamp if I live in Spain?

[@matteenshabon7662]

AMAZING WORK, Very Clean vocals and Speedy Demonstration.

[@bricourie313]

This helped me so so so much. I cannot thank you enough

[@1samc]

Pygmy hippos brought me here - I stayed for the stamp

[@bGlennjamin]

You can enter infinity into the calculator with the input "E99".

[@SZ-rz8hj]

@MsUsagi513 Nah just E99 works, it's the same as 1E99

[@bowiee4021]

you saved me for my final exam, true hero

[@arfysperez6525]

Super helpful! Thank you so much

[@bcthomsen]

YES Very helpful in class it shows something totally different Thank you much

[@puddingg7861]

thank you so much, i have a test today and this video is a life saver! great job

[@holycanolibatman]

u sound like toby maguire a little

[@kianajones1999]

How do I change the factory settings. Whenever I use invnorm( my calculator gives me two extremely long decimals :(

[@avac3036]

clear and concise! thx

[@gavinsimmerer7363]

you are the King of stat

[@sanikadatar6312]

this helped so much!

[@spacelife10]

thanks!

[@drinkcoconutwater]

Cool stamp

[@wholesome3free895]

Can I also use normalcdf for the problem below? How can I find the answer using the TI-84 calculator?
A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 218.7-cm and a standard deviation of 1-cm. For shipment, 6 steel rods are bundled together.
Find the probability that the average length of a randomly selected bundle of steel rods is greater than 218.8-cm.
P(M>218.8-cm)=
Enter your answer as a number accurate to 4 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.

[@karimnaufal9792]

Love the normal stamp, awesome idea! 😀

[@icyhot8474]

Thank you

[@shannonbrooks9003]

thank you

[@TheBillyizawesome]

that stamp is sick mate where do you find them??

[@larrygrabb]

Very nice video. What do you use normpdf for? I mean it practically gives the probability for a specific value (e.g. approximate a binomial distr. with a normal distr.) and you want to find out k=3, normpdf gives an approx. value but since the integral from 3 to 3 is zero, how can I interprete the result? Only as the density?

[@user-kt4gx4qd1r]

Thank you so much!

[@tetravx-553]

Life saver!

[@Jason-cq8oz]

thanks, clean video

[@funckay]

wtf this is so easy when you explain it

[@sonnysmith1878]

Thank you!!!

[@tutkevich]

THANKS!!!

[@trishnhan3534]

thank u king

[@princeray4789]

i got all the rest other than the percentages, how is that 10 percent it looks a lot more so i’m confused on how you got that placement randomly?

[@madisonabbassi3032]

thank you!!

[@hectichive889]

So when we’re talking about area, is that the percentage of values or data or whatever in the set?

[@sofeafraziali4783]

Percentage of value

[@Jalahto]

What if they ask no more than? what would be the upper or lower?

[@prodTyeDye]

better than my teacher

[@sickswunsolja]

this is cool and all but does anyone else get these problems without mean and standard deviation and have no idea what to put in those spaces ?

[@evanderm8158]

I need that stamp

[@davidellinger8837]

I grade AP Stats exams. You've got one major problem here: students need to know how much information to put down in order to get credit for work. If they draw a good picture, they'd probably be ok, but it would be GREAT for them to write instead: "normcdf(Left bound = 204, Right bound = infinity, mean = 200, SD = 3.5)" with the answer. Students need to label your "calculator speak" so the reader knows what the different numbers mean, and in your case the "work shown" (not counting the picture) would give the student an Incorrect. If students are really good with clear pictures, they can communicate the same info and be ok, but I find in grading these that students are inconsistent.

[@caleb74]

i need that stamp lmao

[@leam5949]

Thx a lot dud

[@jackwollermann2455]

you are a beautiful man

[@anyoneanyone3515]

Slow down damn ...

[@painteater]

thanks!