Question

What are meaning determine by these symbols?
NO STUPID ANSWER
and explain each symbol breif.
Pls!

Answer 1

The first symbol is of sigma.... meaning sum of a range of numbers...

x with a bar is a symbol for mean and here mean is calculated

Answer 2

heya,

the symbol of ∑ is called as sigma.
f1 = frequency
x1 = variable. 

x with a line is called as x bar.


mean = $\frac{sigma f1*x1}{sigma f1}$


thanks