So I found the mean that was 600 then i did the step where u subtract the numbers by 600 and then I squared the dif and added the numbers and got 1500314 what do i do with this number?

Question

anonymous · Answer

sorry um im trying to find the standard deviation

anonymous · Answer

@sue101

anonymous · Answer

@rizwan_uet

anonymous · Answer

What you are saying is a little confusing. Why don't you post the question? :)

anonymous · Answer

Im trying to find the standard deviation and i just need to kno the last step. I found the mean and i subtracted the mean from the numbers then i squared teh difference and added the numbers and got 1500314 now i need to kno wat to do its like n-1=?=? idk what the last step is....

amistre64 · Answer

id suggest working with a "smaller" set .... subtract 100 from all of it

amistre64 · Answer

itll retain the same standard deviation

anonymous · Answer

idk wat u r saying i just need the last step after adding.

amistre64 · Answer

im saying; make life easier on yourself ....  subtract 100 from all the numbers; if your mean is 600, then your modified mean will be 6

2, -2, 3, -14, 1, 10

anonymous · Answer

wat????

amistre64 · Answer

in fact, this is a good way to find the mean .... since its just going to be 100 more than the smaller set ... im sure im speaking english :/


  102     98    103     86     101   110
-100  -100  -100  -100  -100  -100
-----------------------------------
     2       -2       3    -14         1      10

amistre64 · Answer

2-2+3-14+1+10 = 0 ...  that was sweet

your original mean should been 100 ....

anonymous · Answer

no the book told me how to do it... dude please just tell me the last step. its like n-1= something wat is that last step?

amistre64 · Answer

since the mean of this smaller set is 0, all we need to do is subtract 0 from each value ... and square

2^2    = 4
-2^2  = 4
3^2    = 9
-14^2 = 196
1^2     = 1
10^2   = 100
---------------
add:    = 314

your set is assumed to be a population, unless it was stated otherwise elsewhere, so divide by n = 6

314/6 = 52.3333  ; sqrt that for the std deviation

sqrt(52.3333) = 7.3422

amistre64 · Answer

the numbers YOU found are waaayyyyy off;  since the mean is not 600 ....

texaschic101 · Answer

I know what she did....she just added the numbers together....you then need to divide by the total numbers (600/6 = 100). The mean is 100.