Question

What is this sign called?! I'm going brain dead!!

Answer 1

\[\sum_{1}^{?}\]

Answer 2

Summation

Answer 3

Its called summation or sigma

Answer 4

SIGMAA!

Answer 5

Thanks! Any idea on how to use it with graphing Calc.?

Answer 6

I have a Ti-84

Answer 7

Guess u need to hit sigma and put your numbers within ( and )

Answer 8

I can't find sigma. ;)

Answer 9

Well, integration is basically the summation of all the numbers.

Answer 10

Integration could be used in the graphs

Answer 11

Yes, Integration =summing up , actually
You could probably go with it.

Answer 12

OK. I have to find the variance using the formula \[\sigma^2 = \sum_{?}^{?}(x-x)\div n\]

Answer 13

There's a mark above the second x signifying mean but I don't know how to type that. :P

Answer 14

you mean x-bar

Answer 15

yeah

Answer 16

is there a way to do this on the Graphing Calculator?

Answer 17

just use wolfram if u cant work that graphing calculator

Answer 18

your post topic is jokes tho lol
"im going brain dead"

Answer 19

haha yeah...

Answer 20

you are given a data set:

find the mean to zero out the data set .... by subtracting the mean from each "x"

square the results and find the mean of the squares

Answer 21

OK I've done that.

Answer 22

then youve found o~ ^2

Answer 23

Alright I think I got it! Thanks guys! :)

Answer 24

cya later peasant

Answer 25

cya!