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If you earn the grades of 81, 84, 78, 80 in four tests what should your final test’s score be in order to have an average of 81%?

.81x400=324
Need a total of 324 pts
Test grades so far 81,84,78,80 = 323
324-323=1
You need at least one more point in order to have an average of 81%

is this correct?

  • math -

    Assuming the final test has the same weight as the other four, then total points you need will be 500*0.81=405.
    How many points do you need in the final test if the cumulative total is 323?

  • math -

    82 %

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