ECZ 2022 P2 GCE - Statistics || S.D || Mean || Variance || Percentile

[@HarrisonjzuluTutor]

hello kindly note that there was a mistake on the variance,the calculated answer on the calculator, i miss calculated but the procedures are all correct. thanks so much

[@EdinaNambeye-y9g]

I don't know if my calculator has a problem I can't get that answer

[@MaryMukonde-s1h]

On the variance am getting 37.2 before dividing with 20

[@lukeshimuonga612]

Me too it's giving me 37.2

[@mubikamubika8412]

Me too it 37.2

[@antenna7002]

It’s too big to fit on my calculator 😢

[@GraceSimenda]

Good explanation sir may you continue doing good may god bless you

[@xavierian7694]

my variance was 1.86.....thank you sir

[@johnyenesha8691]

Same here how is getting

[@macfarenchanda]

So like when you square root 1.86 you round it off to how many significant figures

[@mwepukazhika5500]

Same

[@JudyHatuleke]

So on SD are we not supposed to divide by total frequency

[@HarrisonjzuluTutor]

with that method you just need to get like that

[@JudyHatuleke]

@@HarrisonjzuluTutor orty Sir

[@Ronald06-e4o]

My teacher says we should use the table formyand not this one.
Is this formula okay to use?

[@RosemaryKasikila]

It's very much ok en easier

[@RosemaryKasikila]

The table is a time waster in the examination room

[@DadaAketchDeng]

Well explained, sir. i got a little bite knowledge

[@astonkuyokwa1572]

Sir you are brilliant learn ed alot from you.

[@HarrisonjzuluTutor]

Am really humbled

[@VeronicaKasanda]

Wow amazing 🤩😍

[@bwalyamwaba7941]

Why are you using formulas for grouped data?

[@NaligatP]

Thanks for your efforts

[@ClaraMulenga-vo7bt]

Sir,but if we check the formula for ungrouped it is not corresponding you are using one for grouped data.

[@MirriamChitapankwa]

Very true

[@spiwetafeni6860]

​@@MirriamChitapankwathis formula is very ok, just follow.

[@pienaarheither4132]

Please Sir, I'm doubting my answer 😢 on ; The rainfall recorded in various places in 5 district in a week are given as follow. Rainfall in mm; 45,50,55,60,65,70 and number of places : 5,13,4,9,5,4.
Find it's standard deviation.

[@DavidMahela]

Thank you for helping us go ahead sir god blessing you ❤❤❤💯

[@RobbyNtemenaa]

It's me Robby from southern province within sinazongwe district, I understand very well Sir thank you.

[@lukalabapensulo6151]

That is wrong especially the on standard deviation! He was lying

[@KoechIsmael]

🎉Xthank you teacher

[@MwewaKelvin]

Well explained thanks very much

[@tinachinyuka126]

Wow so crear thanks so much God bless you 🙏❤

[@catherinehamukabika3053]

This is great Catherine from monze very clear

[@FaithChaneka]

Sir there is a mistake on the variance kindly make the correct variance

[@BervinMilambo]

What if I have used formula for grouped data?'

[@mutaminwamwanza4674]

Well explained sir ❤🙏🙏

[@EdinaNambeye-y9g]

This is for grouped data please

[@CostenDax]

Thank u sir 😊😊😊❤ wonderful

[@MonicaMusole]

Thank you so much ❤❤

[@lucykasongomuba2777]

This is grouped data sir

[@ChristonKutwi-vv1yj]

Powerful one

[@MaryKabulo-cv5jy]

Thank you😊

[@MutebKaumba]

Is sir prus 😂 but I understand 😅 thank you

[@jeremiahmwale6930]

I thought mean has a square

[@HudsonChingandu]

My variance is 1.86 hence S.D is 1.36

[@HellenNalwimba-zp2po]

1.86

[@DavidBanda-nd7io]

Wow❤❤❤ thanks

[@KuyemaetaKuyemaeta]

Check your work on variance sir. It's wrong start again

[@CelinaCelinanawale]

Thanks sir

[@MukukaChumachuma-k7s]

Bakamba zoona 😭

[@ritachoice]

Sorry sir I don't no cause my variance it giving me 1.86

[@HarrisonjzuluTutor]

That's the correct answer. I made a slight mistake on my calculations

[@lukalabapensulo6151]

I am teacher of mathematics, the tutor used standard deviation formula for grouped
That is very wrong

[@Estherpomat]

The variance is wrong chack again

[@HarrisonjzuluTutor]

If you are able to follow clearly you wouldn't have commented that.
I even said confirm the answers, I know they are mistakes there

[@lukalabapensulo6151]

Even the formula is wrong

[@PETERHSICHIYANDA]

❤❤ MI

[@chimwemwemgomba6791]

You made a mistake on variance

[@HarrisonjzuluTutor]

Yes missed one digit on the calculator. But methods are all correct,

[@davidmichelo3814]

Am new to this method on finding the variance are you not supposed to use the same method used when finding the mean, but to only square them eg 0(1)²+3(2)²+3(3)² just like that then divide by the total number of frequency which is 20.

[@jeremiahmwale6930]

That's what I thought too
@davidmichelo3814

[@chileshekhosa896]

The formula you have used is for grouped data. The variance is wrong.

[@SiboneloCedusizi]

How

[@lukalabapensulo6151]

Yes it was wrong, he must be a grade 12 not a Teacher who is trained in Math

[@AledyMutambo-t4g]

Yama you have made a mistake

[@HarrisonjzuluTutor]

If you followed me clearly I was saying that, type and confirm meaning I can make a mistake on my calculator but procedure is very correct 💯

[@JosephMulenga-s3i]

Plus not prus

[@OlikaChisebe]

You're for violence yoh🤣🤣

[@BettyBanda-iw3ve]

Yaba😂😂😂

[@antenna7002]

It’s just an accent have some respect he’s teaching your dumbass for free btw.

[@MemoryKumwenda-un8wm]

No one is perfect