The average of your first 6 tests is 82. If your test average after your seventh test is an 80.5, what did you score on the seve nth test? Question 2 options:
1 answer:
So average is of the first 6 tests is 82 well that means (test1 + test2+ test3+ test4 + test5+test6)/6 = 82 so now let do some cross multiplliying test1 + test2 + test3 + test 4 + test5 +test6 = 82*6 test1 + test2 + test3 + test 4 + test5 +test6 = 492 now lets see if we can find that 7th test score (test1 + test2 + test3 + test4 + test5 +test6 + test7)/7 = 80.5 So look we found test1 + test2 + test3 + test4 + test5 +test6 to be 492 so lets substitute. (492 + test7 )/7 = 80.5 test7 = (80.5*7)-492 = 71.5
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