Math Destroyer Standard Deviation Q

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Troyvdg

Dentistry not Debtistry
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Math destroyer seems to have a few of these standard deviation questions, and when I read the explanations I'm just like :scared: 😕 For any others out there that faced this challenge, what resources did you turn to?

Thanks,
Troy
 
Is there a certain problem you're having difficulty on? I can explain it/work it out. Or you can use khanacademy's videos on youtube! He has chemistry, biology, AND math videos. Really useful any of those subjects. patrickjmt also has good math videos. Hope this helps!
 
I was going to suggest Youtube as well! They have very good and easy to understand explanations. I know this because I took Stats last semester and my professor didn't always teach effectively.
 
If you are talking about the 68-95-99.7 questions just dont even read the stuff it has for the solutions just kind of look at the graph it draws for you explaining it.. I pretty much just have that graph photographed in my brain and just think of it for all those questions..

On the other hand if you are talking about the ones like.. which has the biggest standard deviation it will give you choices like..

(8,10,12,14,16)
(24,26,28,30,32)
(40,42,44,46,48)
(1,3,3,5,7)

Then you dont have to do any actual math just look at the one that is different than the others.. The 1st three are all separated by just 2 points from the median/ mean, and then 2 points from that # (which means they all have the same standard deviation). The last one on the other hand has a completely different than the others and thus is the only 1 that could have a different SD so it is the answer..

And on the 3rd type of questions which actually deal with calculating the SD that is just a formula you have to know.
 
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