How to find a missing value given the mean | Data and statistics | 6th grade | Khan Academy

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Learn how to find the value of a missing piece of data if you know the mean of the data set.
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Grade 6th on Khan Academy: By the 6th grade, you're becoming a sophisticated mathemagician. You'll be able to add, subtract, multiply, and divide any non-negative numbers (including decimals and fractions) that any grumpy ogre throws at you. Mind-blowing ideas like exponents (you saw these briefly in the 5th grade), ratios, percents, negative numbers, and variable expressions will start being in your comfort zone. Most importantly, the algebraic side of mathematics is a whole new kind of fun! And if that is not enough, we are going to continue with our understanding of ideas like the coordinate plane (from 5th grade) and area while beginning to derive meaning from data! (Content was selected for this grade level based on a typical curriculum in the United States.)
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[@jljyeet6662]

Simpler method Add the data or Ages: 5+2+2+4+8 = 21 Multiply the mean to the *AMOUNT* of the data or ages: 4 x 6 = 24 Subtract The SUM of the Ages to the PRODUCT of the mean and amount of ages: 24 - 21 = 3 The missing data or age is 3

[@jillianglasser7405]

What if the ammount of all the ages added up is more than the number of ages times the mean

[@qteachai]

Jlj Yeet THANK YOU!!!!

[@stavshmueli6932]

@@jillianglasser7405 That can never be the case - by definition of the mean, if you multiply the mean times the amount of data points (the different ages in this case) you will get EXACTLY the sum of the data points (sum of the ages in this case). Both methods are applicable to solve these types of questions.

[@cybermiddi6742]

Jlj Yeet Life saver.

[@Horologica]

Thanks a crap ton

[@mohammedal-sharab3300]

If you want a simpler way to solve or comprehend problems like this, I'll show you a trick that I developed randomly while I was solving my homework. I will use the same example used by Sal in this video. First, do the mean times # of ages in this case. 4 times 6 = 24 Then, add all of the # of ages that you already have. 5+2+2+4+8=21 Finally, subtract your mean from the total # of ages you have. 24-21=3 Both methods that Sal and I used got the same result but in a similar yet different way.

[@hotdogman6440]

thank you

[@Victoria-ro4om]

Thank u so much this help so much what he was doing was so confusing 😃

[@ishikagupta2137]

why you did 4 times 6

[@adorekimiz]

Omg thank you

[@ratdundruff5843]

@@ishikagupta2137 the mean is four, and u have six kids

[@deletedgirlfriend8171]

You can also- 1. Add all values from the data (table). 2. Multiply the mean/average by the number of how many values there are. 3. Subtract the product from the sum, or vise versa.

[@djaxbo]

ok kool

[@محمد-و5ض3ص]

Thx

[@postiv3postz188]

Thank you 🙏

[@AmarniGrace]

Aw thankyou, I was actually confused by the main video with everything going on. This is such a straightforward method. ❤

[@jonathanzhu6917]

Thank you so much, I've been having some trouble when it comes to those questions because when I do my practice booklet, the answer page doesn't show the process of getting to the answer. This video helped me so much, thanks Khan.

[@desiloumbrinis3160]

Why would someone put a thumbs down? He is trying to teach you math.

[@150YK]

its other KZbinrs that are hating on him for he gets more views.

[@kidkittrell9046]

how do we calculate the memes

[@krispyvc7686]

Memes?

[@justvis1on399]

lol ;D

[@dhanwith5990]

By watching pewdiepie

[@patiencelewis1877]

Yes

[@shayansaeed2765]

You calculate the "MEAN" by adding all the numbers you want to add and divide it by the amount of things you added Ex: Find mean of- 33,65,889,59,99 All of it added is-1145 Divide (1145/5) Mean=229

[@kouxiong4755]

you are the best!!! I missed one class and I watched your video and got my homework done!! thank you!!!

[@A1ixity_]

Same

[@VibhorDubey99]

Thank you so much, this was extremely helpful :)

[@chadfreeman1900]

RockinTheMachine noice pro pic bro

[@KartikaKakaraparthi]

Thank you all so much, the video and the help in the comments helped me finish a question that I was stuck on for a long time! 😅

[@hellbaby]

Thanks Sal!! worked out perfectly!!

[@supagonsungkapan737]

Thank you for the help!

[@thanxreaperlux1126]

This guy's math is another level simple problem solve with most complex way

[@Souls_of_the_Dead]

Also can you put this as one of your practice questions in the app so we can practice doing it?

[@furret1907]

Thank You Sal

[@kayyumkhan749]

I love khan 🏫 academy ✍️📖

[@amnaclean]

the case of the missing number is solved..

[@ameliacorns2144]

OMG I didn’t get it at the start and now you have helped me complete my homework thanks

[@sgriffett541]

aGAIN kHAN ACADEMY GETS ME OUT OF ANOTHER GRADE 8 MATH CLASS jam... whoo hoo nice bit of internet searching on my part as well... yipeee, great way to end the year!!! thank you!!!! see you in september

[@paigemadeline4320]

I;m in 6th and I have to know this...

[@LilVador]

great video. I enjoyed it very much.

[@wizzalien7796]

this seriously helped

[@venomous_0578]

so it's like working backwards right?

[@jemareazada]

+Frxo Basically something like that

[@rooseveltballah1174]

Is like looking carefully

[@bostonjones1308]

thank you so much

[@assassin4845]

First video of Khan Academy!!!

[@sonakshibag7494]

Thanks my guy!

[@blazelightshine2311]

There are 6 numbers and the mean is 4. Adding all the numbers there are shown is 21, and you would divide the number by how many numbers there are, that's 6, so after it would be 4x6 which is 24, so the missing number is 3.

[@Elserag96]

What if the mean is missing too?

[@fadhliawahab7849]

thk you bro :) you explaination is so much clearer

[@dabonkus1709]

this was so helpful tysm

[@malamalini9784]

Khan, will you help me by making a video on finding 2 missing frequencies when 2 mean of distribution is given? Please...

[@rli867]

Very helpful 👍🏽

[@samela1239]

helped me a lot

[@angelacruz6121]

Oh M G this is the most complicated expectation ever

[@SuperKoopalingsStudios]

I have question if you end up getting a decimal num her like 1.2 as your answer do you round or just leave it alone

[@abdullahahmed8346]

Thank you

[@Souls_of_the_Dead]

Can you do a series on the ged test like you do the SAT test In your app?

[@malexflame2404]

thx helped

[@harpertang1703]

Everyone here when tests are up

[@sandradacherry1992]

What do you do when there is more than 1 missing number?

[@CAceDubz]

Let's say that we only have the numbers 5, 2, 2, 4 and the last 2 are missing. Add up the numbers you have 5+2+2+4+x+x which is 13. Multiply the amount of numbers/variables (6) to the mean (4) You get 24 24-13=11 The rest is a guessing game. If you have 2 missing numbers/variables (like this example), split 11 any way you feel like it would make sense. If you can't afford to guess then I don't know. I'm not a professional at math like Khan so I don't know any better way. In Khans video, the numbers are 8 and 3.

[@rjl7146]

Thanks, this helped so much. I was totally paying attention in class today XD.

[@spicy_noodle]

Lol

[@LilVador]

I'm 26 years old. I'm amazed this is for 6th graders :)

[@dabonkus1709]

mean * number of ages = total. without the missing value, find the mean. then, subtract the mean from the total

[@CrafterWave707]

Thanks

[@planetarmy1985]

Thanks for tha help

[@extra3445]

thanks king

[@fsxurdu5893]

Awesome, really made very easy, may i know what program younuse to teach? Since it looks very user friendly

[@Jacob_Mango]

Perfect

[@gabrielleB22]

The issue I'm having is that the variables in the given list for my problem is long. I have 15 numbers to keep track of, so I'm going to try, but I'm still lost. Edit: Also my missing variable is on the very end of the list, so this was very difficult.

[@rayyyzz7]

How do you find it when there’s two missing numbers and you’ve been give the mean and range

[@shivananseecharan2575]

OMG TY SO MUCH

[@raamaa444]

Can someone help me with this equation pleasee (i tried everything but my result doesn't match with the book answers) The mean of 8, x, 17, 2x+ 3 and 45 is 23. Find the value of x. The answer is x=14

[@samster201]

12

[@godwinini4941]

I'm having one issue, we are asked to find the missing numbers in a group data but the the total frequency number is not given, please I need help. Thank

[@SanjeevKumar-iu3nv]

Well solved

[@Auragasm16]

What if you only have one value and need to calculate more?

[@dynaspet9579]

Pls sir i have doubt I have question Mean of 6 member is 17. It was found out letter that 21 was wrongly written as 12. Find the correct mean of the observation But i didn't understand your video can you pls help me with this problem

[@leighannenychelle8383]

this helped but the method is way to long.

[@abhinandanrj6582]

The average of 12 numbers is 30 if the sum of first 3 numbers is 85 find the fourth number? How to solve this

[@tractor_lover_UP]

Add the date of ages 5+2+2+4+8=21

[@vomou2951]

is there any shorter method?

[@aasta4099]

HAHAHA

[@kenzeeinches]

CAN SOMONE TELL ME HOW TO DO THAT BUT WITH TWO UNKNOWS PLEASE MY TEST IS TOMORROW

[@FredLewis-Hedley]

bro sounds like Frank Zappa

[@Klaizee]

why is there no sound

[@NazrulIslam-ug3uc]

A=k*r^2 A=100 k=4 What is the value of (r) Can anyone show the working out please thank u.

[@alexp5005]

You should use Reddit or yahoo to help you, not KZbin

[@jemareazada]

+Alaur Rahman I really don't understand anything in your comment

[@peter_roth_8812]

What about two missing ages?

[@venomous_0578]

thats easy lol

[@chadfreeman1900]

Frxo then tell him how to 😛

[@Abdd17]

sense

[@SweeteaDove]

Or you could just call the parents and ask. XD thanks, though, I have math test today, and didn't know how to do this TwT

[@jeavon69]

3

[@lauramunoz3990]

I don't get it

[@ttkentertains]

W vid, W comments

[@alextaylor1831]

Who is watching this the night before an exam

[@FNAF_FAN_Unknown]

The number behind the blue stuff is NOT 3 the number should be 6 NOT 3

[@helloo157]

no lol

[@helloo157]

are u taking ap stats

[@bradenhatton8967]

What about if you don't know the mean

[@bloodypainter8431]

Thx

[@monjurai6742]

I can't understand what you mean. Your sentences are mixed together.

[@Duh7haha]

Dumb

[@Vex380]

Not helpful at all

[@cliff6564]

Man math is such bs. Just call up the parent and ask how old the kid is.

[@dbancoegg1547]

Lol

[@Abdd17]

this makes no sensr

[@emmieleopoldo7551]

i knew it

[@robertguernsey6464]

First comment.

[@everfluctuating]

good for you

[@robertguernsey6464]

;*

[@peter_roth_8812]

Not very difficult on this channel, but lucky you are.

[@jemareazada]

+Robert Guernsey Do you want a cookie?

[@derivedfever807]

you are cancer

[@maryamalmarzooqi5183]

thank you so much

[@apollo2961]

thank you

[@asiacraig]

Thank you so much you helped me understand this topic in my class better thanks for making this video it helped so much!!!

[@onur1808]

thanks

[@gsm1021]

Keep writing all over the board to make it more confusing. If your kid is a point and shoot kind of kid and doesn't get it. Writing all over the place doesn't help

[@katdavies1622]

Well that was a very complicated way of doing it. My poor brain

[@KhalsaMobile-rm3kr]

Thanks

[@mansijain8064]

Thanks

[@zanenewborn]

me watching this in 11th having no clue i learned this 5 years ago

[@Naitrio]

what program do you use for your drawings?

[@Klaizee]

for people who can hear the sound just turn the subtittles on

[@richelleesquejo5419]

What if two values are missing?

[@kamilatijani2651]

He’s making this difficult, just times the average by how many numbers there are then whatever answer you get for example 30 I’d add all the numbers that you know already, for example 2 7 5 6 1 then take away the answer from 30

[@cookie-chan2368]

his voice kinda....

[@savagekool4470]

try doing long math

[@EmnetCoki-uk1nc]

thanks 🎉

[@khdamerkhail9965]

So complicated

[@m.evangelineleethiyal188]

Noooo it is failure

[@abdullahtahabsem1816]

Thx sal you really helped and don’t let the diss likes get to you

[@rowan8240]

Thanks

[@rushdaamerali2569]

agree