Which of the following formulas, written in summation notation, would represent the mean of the data set {X1,X2,....,Xn}? Explain your choice.

(Picture of multiple choice below)

Question

Which of the following formulas, written in summation notation, would represent the mean of the data set {X1,X2,....,Xn}? Explain your choice.

(Picture of multiple choice below)

angel_kitty12 · Answer

These are the multiple choice. I'd appreciate the help since I wasn't taught with this kind of calculator exactly.

solomonzelman · Answer

The mean (or the average), is the sum of all values divided by the number of values.

solomonzelman · Answer

How do you write the sum of all of these values using the Sigma notation?

angel_kitty12 · Answer

So would it be 1/n the sum of all values (4) in the multiple choice?

solomonzelman · Answer

Yes it is option 4.

angel_kitty12 · Answer

Sigma notion?

angel_kitty12 · Answer

Oh okay thank you very much!

angel_kitty12 · Answer

The formula I learned was different that's why. Thank you very much!