What is the mean of the sequence ?

[math 2019]

[2,5,7,3,3}
What is the mean of this sequence , help me please because it is my first time doing it today and I'm a bit confused .
Thanks

 

[MarkFL]

Is that exactly how the problem was presented to you?

 

[math 2019]

yes

 

[MarkFL]

Well, if you are to find the arithmetic mean (average) of that set of values, then add them up, and divide the resulting sum by the number of elements.

 

[math 2019]

You as perfect as always , million thanks

 

[math 2019]

I can't get the mean of this set
[1,2,3,8,7}
Thanks in advance
I got 21 ,when I added it up and there is 5 elements in the set .
Should you just right 4.2 or is that wrong?

 

[MarkFL]

Yes, you could write:

[MATH]\overline{x}=4.2[/MATH]
or:

[MATH]\overline{x}=\frac{21}{5}[/MATH]