Question

I'm in class 9 and I cannot understand the meaning of sigma in statistics.
a property is there that is the algebric sum of deviations from mean is 0.-what does this mean. plz guys help me...

Answer 1

Sigma is a greek word which is used in mean.
This property means that
Sum of observation
--------------------------------------------------
Total no. Of observation

Sigma fx
----------------
Sigma f
Hope you understand

Answer 2

In simple words Sigma is sum of something
Ex- Sigma F means sum of all of the frequencies you have in your data
 i hope you get it