How to calculate Standard deviation, Variance and Mean in Casio 991 ES Plus

In statistics, the standard deviation (SD, also represented by the Greek letter sigma σ or the Latin letter s) is a measure that is used to quantify the amount of variation or dispersion of a set of data values.
Variance is the expectation of the squared deviation of a random variable from its mean, and it informally measures how far a set of (random) numbers are spread out from their mean.
This video will show you how to calculate variance, standard deviation and average in Casio 991 ES Plus calculator.

[santigli]

Be careful:
-dx is the standard deviation of the population (uses N as denominator)
-sx is the standard deviation of the sample (uses N-1 as denominator)

So either way you'll have to make it ^2 in order to have the variance, which will be respectively the Var of population or of the sample.
Great video anyway!

[Theguywithephonyname]

My goodness… i suck at knowing the capabilities of my calculator. Thanks this was very helpful, I used to manually input the values of x and x bar etc, to solve SD it was very stressful and inconvenient since we always had limited time in tests

[sunilchanda]

bro here σx is the population standard deviation having denominator of n
where as sx is the sample standard deviation having denominator of n-1
make it correct..
variance is nothing but standard deviation^2

[minmaxmath]

Guys there is a mistake in this clip, sigma x @2:30, is not variance. It calculates standard deviation in case the data you used is population. which is different from Sx, sample standard deviation. Be aware

[mdasiuzzaman]

How do you produce a video without learning the subject??

[yashmishra]

that's not variance. It's Population Standard Deviation. Moreover, variance is the square of SD which is obviously not true in that case

[MillsMassy]

💃🏼💃🏼💃🏼💃🏼 did this inclass and my lecturer didn’t know how to use a casio, said we have to figure it out ourselves 💃🏼 thank you

[salmanalphatron]

Thank you for taking time and uploading this video!! It was pretty useful 😋

[DeJake]

Variance is wrong! For variance you have to square the standard deviation (sx). I'm pretty sure óx is population standard deviation

[annfernandez]

Tnx for the vid.pretty useful as I am computing now for the test result.

[abhilashhm]

Very easy to understand. Thanks a lot for this video 👍

[milkbeforecereal]

wow u have saved my life. very very greatful

[sakanimotalahiajoke]

Thank you so much for this. It's really helpful.

[letsgofishingtv]

thank you for this video sir it helps a lot.

[zygamex]

Please work on your audio.
Edit: Btw, your video is helpful! Its help me a lot! Thank you!

[mahach]

Thankyou so much for teaching this. Keep it up.

[fatimahaleid]

THX bro, BUT the variance is square of SD
so it must be SX Square

[Eka-xkwy]

my calculator shows only 1:type 2:data 3:Edit.. then how will I find mean option?

[as]

Thanx brother your video is really helpful

[farhansaleheen]

Where can I get these emulators?
Someone please tell me, would be very helpful