Please help me with AP stats (question 4)?

the answer is supposed to be A) but i cannot figure out how to get that answer!!

Relevance

az_lender
Lv 7
1 month ago
(9195 x 556 + 2439 x 589) / (9195 + 2439)
= 6548991/11634 = 562.9, round to 563.

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