How do you check average opponent's rating for a participant in a chess tournament?

How do you check average opponent's rating for a participant in a chess tournament?

For example in this:

http://chess-results.com/tnr377792.aspx?lan=1&art=1&rd=10

there seems to be no information about the average opponents Artemiev Vladislav faced here:

http://chess-results.com/tnr377792.aspx?lan=1&art=9&fed=RUS&snr=11

It's simple math. Add all of the ratings and divide by the number of players. Here, the addition of 10 ratings gives 26,452, so the average is 2,645.2.

@Rabbinvane , what if I want to check that of 50 players within a short time?

My question is: Is there a way to check that on the table or on the information provided on the Chess Results Server WITHOUT doing the manual arithmetic as you suggested?

@Fabiano_Caruana_1 , maybe use a calculator? Or something that is made to do that? /use another tab to do that