SOLUTION: After five English tests, Michael's mean mark was 65.In the next three English tests he scored 70,75 and 80. Find Michael's mean mark for all of these English tests.

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Question 634800: After five English tests, Michael's mean mark was 65.In the next three English tests he scored 70,75 and 80. Find Michael's mean mark for all of these English tests.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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After five English tests, Michael's mean mark was 65.
In the next three English tests he scored 70,75 and 80.
Find Michael's mean mark for all of these English tests.
:
He took a total of 8 tests,
av = %285%2865%29%2B70%2B75%2B80%29%2F8
av = %28325%2B225%29%2F8
av = 550%2F8
av = 68.75%