[im a model]

ive been keeping track of what has been happening once i am all-in. please calculate my expected value giving the following 6 all-ins:

i was %80 in a $96 pot.
i was %80 in a $138 pot.
i was %72 in a $56 pot.
i was %83 in a $330 pot.
i was %70 in a $108 pot.
i was %75 in a $155 pot.

i get that i should be up around $660, but i just averaged my percentages (around %75) and then multiplied that by the some of the pots (so it was like .75 times like 980). please let me know if this is correct.