Serious question on Sigma Notation. Helpp!!?

Question

Ok I need help with this :

Right this sum of a series in Sigma Notation:

2/8 , 4/11, 8/13, 16/16, 32/19, ...

I already know there are 10 numbers in the series. So I would have

10
Σ

But I don't know what to put for the equation or what
term it starts on.
(n = ?)


PLEASE PLEASE HELP!!!! THANKS SOOO MUCH!!

I meant Write. hmnm I not sure why I wrote that!

Sorry, That is supposed to say 2/8, 4/11, 8/14, 16/17...

Answer 1

Atarting with n=1 or n=0 is usual, but since you know you have 10 terms and you use 10 as the end you must use 1 as the beginning:

10
∑
n=1

The numerators are powers of 2 with 2=2^1, giving you 2^n. The denominators are a problem, though. You can't express the sequence with a simple expression in terms of n. The only way to keep the formula simple seems to be to leave the first 2 terms out of the summation:

10
[∑ (2^n)/(3n + 1)] + 2/8 + 4/11
3

Answer 2

In statistical technique administration it refers to "conventional deviation." in spite of the undeniable fact that, SPC shoppers with indepth SPC awareness understand that sigma and classic deviation are no longer precisely the same. to verify authentic sigma, shoppers could additionally use a persevering with table, which has numbers in keeping with subgroup sampling quantity. conventional deviation makes use of the same formulation, yet with out the subgroup sampling quantity consistent fee. From ASK.COM: Sigma is utilized in records to point "conventional deviation". this would be a level of the unfold or version in a determination of numbers. as an occasion if the 30 pupils on your type write a attempt and each physique gets between 70 and 80 then the common deviation of the 30 rankings could be extremely small. If, in spite of the undeniable fact that, the 30 rankings variety style the forties to the ninety's then the common deviation could be extra effective.

Answer 3

http://en.wikipedia.org/wiki/Sigma_notation

The numerator doubles each time.

the denominator increases by 3 then 2 then 3 then 3...
That is all I can see.