This is awesome thank you so much. I'm dealing with a pretty crappy Stats professor who essentially makes you teach yourself. Thank God for Khan Academy because without this I would definitely be considering dropping the class.
Had some pretty awful math teachers in my life who never really helped me when I needed it. In college and taking statistics for the 2nd time after failing it once, got behind one day, and thanks to you I'm back on track!
I'm studying for the DAT and I came across a practice problem similar to this one but worded differently. I'm glad I came here after reading the explanation because they were not clear. This video cleared everything up and now I completely understand how to approach these problems now! Thank you!
It's funny, I learn more from this channel in like 15 mins, than 60+ PowerPoint slides and a chapter of textbook reading over 3 hours... Thanks for the awesome content!
Thank you for introducing me to the ck12 website , this website is trully another gem just like Khan Academy , growing up i always thought and had this prejudice that it was boring and hard , but you make it easy and fun , i think i fell in love with math i always want to learn more even tho im 28 yo
This is what I have been looking for! Finally a few videos outlining how to complete actual questions. Theory is great to know, but it really wasn't helping me actually answer any of my questions in assessments.
Khan, your methods of solving these problems saved me tons of stress and time. I love you and I hope you keep up your great work. P.S. Your interview with Elon Musk was a great watch also!
Okay, I understand how you would get this. But I have a problem with the same concept but I cant seem to get it! 1. The pulse rates of healthy adults are normally distributed with mean 72 and standard deviation of 5. a) What percentage of healthy adults have a pule rate over 80? (Hint: You may want to use Excel here.) at the 95% mark it's 82. do I still use the same method? Is there more calculations?
Hi I have a question; 1). Weights of adult women have a mean of 143 poundsd and a standard deviation of 29 pounds. Approximately what percentage of adult women have weights between 114 and 201 pounds? 2). If 350 adult women are randomely selected, approximately how many would have weights between 114 and 201 pounds?
You can not mix kg and grams like that. He kept saying the standard deviation is in grams but the math he works out must make it also in Kg like the mean value.
what if the value lies within a std. dev not exactly as the point mentioned example mean=750,sd=150 and probability greater than 700...... withour using pnorm() or any z-table ...
On c), I'm confused and wonder what I'm doing wrong. If 3 standard deviations represent 97.7% and that calculates 100 - 97.7, I'm getting 2.3 which, when divided in half (half for below the 3rd standard deviation and half for above the 3rd standard deviation) splits up into 1.15% each. Why am I not getting the same answer (.15%)? (Scratching head and biting nails!)
every time I encounter difficulty I end up at Khan Academy!!! I love your contributions.
+Bat K same here
Same!
I'm passing my test tomorrow! :D! Thank you! What took my professor 2 hours to explain you managed to easily refine in 10 min.
Npc comment
@@joseluisclaro9087 L comment.
ayo bro just realize how many lives you are changing by being a great teacher thank you for helping me with this concept you made this so easy!
I love you!!!! My teacher doesn't explain well at all and I couldn't figure out how to do this for my life in class.
Khan, thank you for helping me pass most of my classes all the way since middle school up until now in college. You are the best instructor ever!
Its been 10 years already, and you're sill helping people thanks a lot I have an exam tom haha god bless!!
like i always tell people, if they are dump in these times, they are indeed dump. thanks much, this was a great help.
This is awesome thank you so much. I'm dealing with a pretty crappy Stats professor who essentially makes you teach yourself. Thank God for Khan Academy because without this I would definitely be considering dropping the class.
Had some pretty awful math teachers in my life who never really helped me when I needed it. In college and taking statistics for the 2nd time after failing it once, got behind one day, and thanks to you I'm back on track!
This guy has been helping me since 6th grade, I’m a senior in college now
Hey Khan Academy guy, your voice is so soothing to me when I'm stressing out doing my statistics homework.
Sal Khan
I'm studying for the DAT and I came across a practice problem similar to this one but worded differently. I'm glad I came here after reading the explanation because they were not clear. This video cleared everything up and now I completely understand how to approach these problems now! Thank you!
omg.. thank you so much.. God will bless you for helping me with this difficult math..
well idk what to tell you
It's funny, I learn more from this channel in like 15 mins, than 60+ PowerPoint slides and a chapter of textbook reading over 3 hours... Thanks for the awesome content!
hey sorry to bother you but how did they got the 16 percent im so null at it
He's more than a teacher. He's a god.
Thank you for introducing me to the ck12 website , this website is trully another gem just like Khan Academy , growing up i always thought and had this prejudice that it was boring and hard , but you make it easy and fun , i think i fell in love with math i always want to learn more even tho im 28 yo
Just found this page, thank god! I could not understand this Rule and now I do! Whoo Hoo!
whoever this guy is... THANK YOU SO MUCH!! SO MAKE YOURSELF A COOKIE BECAUSE YOUR DETAIL LITERALLY JUST SAVED MY LIFE!!
by the minute 6:58 it was crystal clear for me. Thank you so much!
This is what I have been looking for! Finally a few videos outlining how to complete actual questions. Theory is great to know, but it really wasn't helping me actually answer any of my questions in assessments.
**Tears** thank you!!
Khan, your methods of solving these problems saved me tons of stress and time. I love you and I hope you keep up your great work.
P.S. Your interview with Elon Musk was a great watch also!
Actually stand a chance on my test tomorrow. Thanks man
Beautifully explained. 🙏 Thankyou
Thank you so much, very helpful, and congrats with your son, he must be 7 years old now !
It's good ... I like this method to teach .. it's understandable and simple way to recognise the topic ...
Thank you so much KhanAcademy! I swear to God I was hating this rule until right now!
VERY HELPFUL
thank you for this video. helped me alot
i love this guy he is so smart !!!
Thank you!!! This emperical Rule thing was KILLING ME! I get it now.... You are a life saver!
Thank you so much. I love how you make sats more enjoyable.
Great video! Simple, clear and efficient ;)
Thank god for these tutorials
thank you so much. im ready for my final tomorrow
awesome.. u just made it so much simpler
o--- = 1.1 kgs right? and not 1.1 gms
thank you so much for helping me.
Really helpful! Thank you sir!!!!
my teacher is foreign i was going to switch classes but u r def helping me pass this semester LOL
Thank you! You are a great instructor!
This was surprisingly easy. Wow.
Excellent to get me started; thank you!
What if it asked what the percentage was for it to fall in the range of 7.3kg and 10.6kg? Can you explain how to do it if it asked that range?
I found this very useful.
Very Well! Thank You!
Awesome job at explaining, thanks
Thank you so much!!!
thank you for your efforts. Keeping doing great jobs
thank you so much, these videos help allot
MANY THANKS!
Khan for President!!!
Very useful
Omg! Thank you! I finally get it!!
Omg!!!! Life saver 🙏🏽🥂
9.5 kg and 1.1 grams ????
for a min it was messing me up so bad cuz i always try to solve before vid
OMG thank you so much ❤
better than my maths teacher
Well Explained...
Thanks for sharing!
This is amazing! Great work!
thank YOU SO MUCH
Thank you
Thanks man! thanks for sharing!!
Thank YoUUUUUUUuUUUU
you are the BEST
THANK YOU VERY MUCH :-)
Okay, I understand how you would get this. But I have a problem with the same concept but I cant seem to get it!
1. The pulse rates of healthy adults are normally distributed with mean 72
and standard deviation of 5.
a) What percentage of healthy adults have a pule rate over 80? (Hint:
You may want to use Excel here.)
at the 95% mark it's 82. do I still use the same method? Is there more calculations?
Platos Advocate You only use empirical rule if the SD is a factor of the value you want to calculate for.
i love these c12 problems
thank you my lord
Thank you!!!!!!!!!!
you rock! best explanation.
Hi I have a question; 1). Weights of adult women have a mean of 143 poundsd and a standard deviation of 29 pounds. Approximately what percentage of adult women have weights between 114 and 201 pounds? 2). If 350 adult women are randomely selected, approximately how many would have weights between 114 and 201 pounds?
the question is in grams or kilograms?
I finally get it
What does the mean mean?
What if you are to find the probability between 11.2 and 9.8
beautiful
thanks :)
You can not mix kg and grams like that. He kept saying the standard deviation is in grams but the math he works out must make it also in Kg like the mean value.
greattttt thanks
Shouldn't part A be 34% not 16% since it is asking for everything less than 8.4kg. I think it should include everything on the bell curve below 8.4kg.
bless you
at 06:33 you say that 68 / 2 = 32, well, its 34.
Each of the legs of the 68% region are Left=34% & Right=34%, not 32%.
68% is the body without the two legs, and 32% is the remainder. It's not the two halves of the body.
Use the steps shown in the video, and figure it out yourself.
Emperial
What software do you use for drawing these sketches? I use Libreoffice draw and can't stand it .
my hero
Wouldn't 1 SD get you .34?
It's actually 1.1kg.
when it gets like that in stat they use a chart
i LOVE you you are the BEST!!!!!!!
what if the value lies within a std. dev not exactly as the point mentioned example mean=750,sd=150 and probability greater than 700...... withour using pnorm() or any z-table ...
Just wondering why is it .15%
these are very low level problems i need tough problems to get good grades .
@HowAboutSomeTruth1 its 1.1 Kgrams
On c), I'm confused and wonder what I'm doing wrong. If 3 standard deviations represent 97.7% and that calculates 100 - 97.7, I'm getting 2.3 which, when divided in half (half for below the 3rd standard deviation and half for above the 3rd standard deviation) splits up into 1.15% each. Why am I not getting the same answer (.15%)? (Scratching head and biting nails!)
It’s 99.7 not 97.7
His son is 8 years old now
I never knew baby girls were almost weightless...