Normal Distribution | Calculating Probability using Tables (1 of 4)

Here I show you how to calculate the probability of being less than a given value for a Normal Distribution using tables.
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I have learnt more in fifteen minutes of your videos than I have in three weeks of stats lessons! I'm not even exaggerating thank you so so so so so so much!!!!!!

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[@ExamSolutions_Maths]

Pleased to hear that you like them

[@ExamSolutions_Maths]

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[@4216Mickster]

Well done! Great use of both graphs to illustrate this concept. Thank you so very much.

[@dannieboy824]

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[@lennyislenny]

@ExamSolutions Yes - thank you. After doing a few myself I soon saw the benefit of drawing the standardised graph! Thanks for your very prompt reply. Great videos.

[@hafezmansour1563]

You really understand what Normal distribution is....Cheers

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Thank you math man

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Thanks teacher...

[@lauradya]

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[@Zverbz]

I wish you taught at my sixth form. You explain much better than my maths teachers and best of all, you explain the logic in the formulae.

[@ExamSolutions_Maths]

I think it helps. Remember this is a tutorial and without it I could not explain the concepts. So I leave it up to you.

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[@ExamSolutions_Maths]

I would hope so!

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[@ExamSolutions_Maths]

Thank you

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God Bless you ... I wish I can return you this favor

[@ExamSolutions_Maths]

@lennyislenny I would encourage all my students to draw the standardised graph as I believe it helps in the understanding of problems. Especially inverse types. The values in the table I believe are truncated rather than rounded.

[@NyandukoGetrude]

You are my hero!!! Thank you so, so much. I didnt know probability can be so easy.

[@ExamSolutions_Maths]

+Nyanduko Getrude Pleased to hear you are cracking it.

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[@ExamSolutions_Maths]

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[@ExamSolutions_Maths]

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you're a lifesaver! thank you so much!

[@ExamSolutions_Maths]

No probs. Pleased to hear it helped.

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Hi there! what dyou use to make these videos, im thinking of getting an intuos pro for note taking when i go to uni next year and i want something similar to this... but maybe more to the side of long hand written notes for chemistry thanks!!

[@tsimpera]

Thank you very much !! it was very helpfull !! I have a question. Shouldnt the P(x

[@oliviascott8703]

Absolutely fantastic videos. Extremely well explained. I have spent hours trying to understand this and watching your videos brought me to that 'aha' moment! THANK YOU SO MUCH!!!

[@ExamSolutions_Maths]

Thank you and glad to hear you had that aha moment.

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Every time I watch one of this videos I just imagine Christopher walkens is helping me (this is very helpful and i appreciate what you do, my exam is in two weeks so i need to get my head round it all)is

[@ExamSolutions_Maths]

Thanks

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[@ExamSolutions_Maths]

You're welcome. Any support you can give to support my work is always appreciated.

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[@tharindulakshan8026]

super

[@ExamSolutions_Maths]

Thanks for the compliment

[@hamzaderiche9416]

i love you man'

[@iamsopoor9]

my nemesis, the normal distribution.

[@ExamSolutions_Maths]

Cheers

[@lennyislenny]

Thanks very much. I have a couple of questions though. 1) Why did we need the second graph? Why not just do (68-62)/3 and then look up the value for 2 in the cumulative normal distribution tables? 2) Surely if you have a figure that has already been rounded to 4 dp will only become MORE inaccurate if you then round it to 3 dp. Or are the numbers in the table not actually rounded - just incompletely written? I think I may have answered my own question with 2 but would appreciate any help.

[@saeed7632]

this was the best explination ever. can u please make a vid where u have to go backworkds

[@ExamSolutions_Maths]

Maybe this helps www.examsolutions.net/tutorials/calculating-mean-standard-deviation/?level=A-Level&board=Edexcel&module=S1&topic=1840

[@RWC-Ichigo]

hello, i use aqa and i was wondering where do I find the normal distribution table

[@MrHMBoss]

Explained 4 times at school and made no sense, ditching stats class and watching this guy

[@ishidaQuincy07]

how about the '3'(standard deviation) tat use to devide the x - mean???? y it has 'gone'?

[@viennep]

I'm just a bit confused. How do I know which table I should use given any tail that I have. How do I know if it's the normal or the cumulative one?

[@ExamSolutions_Maths]

@Darkish04 Thanks

[@AsisSamsuhang]

Is plotting the graph necessary to understand the question?

[@alid5875]

i couldnt find those tables in my ikea catalogue :/

[@ExamSolutions_Maths]

There in Homebase!

[@RGBY-tv4hg]

@@ExamSolutions_Maths they're

[@shalomaderibigbe986]

so when do you know to use z?

[@luisrodrigueziii7316]

hello why not use table to find prob of x less than or equal to 67 because in the question, x less than 68 does not include 68 you must find prob up to but not including 68?

[@arhamshafi7175]

Watch at 1.25x speed...

[@ExamSolutions_Maths]

I see where you are coming from but no. So you are saying that P(X

[@mai2687]

Ohh I get it now... 3^2=9

[@himanshubhushan3927]

HOW DO YOU DO THAT WITHOUT A TABLE?

[@SuperYtc1]

1 standard deviation and 2 standard deviations are common answers so you could memorise 97.7%. Else, you will need to use tables. It's not possible to calculate without using the tables. The tables have been solved by a computer for us.

[@mai2687]

Where did you get 9? Kindly explain please..

[@menangitisable]

3 is the standard deviation. 3^2=9, is the variance. X~N(mean, variance)

[@saeed7632]

that symble means to the power of

[@BallyBoy95]

Shouldn't you be busy predicting what comes up in the lottery, oh wait *cough* *cough* I mean what comes up in the exam lol.

[@jonathanricketts5164]

wandom vawiable

[@nauman.ashraf.]

HAHAHAHA !! you stole my comment bro xD !!

[@gurpreetkusbia]

I can’t seem to find the tables

[@ExamSolutions_Maths]

Search 'Cumulative normal distribution tables in google' and you will see many come up.

[@Salgandarin]

I lost a pen watching this.

[@ExamSolutions_Maths]

confused?

[@ExamSolutions_Maths]

Cheers

[@ExamSolutions_Maths]

Cheers