math exam tommrow review

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the mean score on a math test taken by 15 students was 82%. one more student takes the test late and earns 93%. what is the new mean score? please show work

  • math exam tommrow review -

    15 * 82 = 1230

    1230 + 93 = 1323

    1323 / 15 = 82.69

  • math exam tommrow review -

    The sum of the original 15 students must have been
    15(82) or 1230
    So now we add on 93 to get a new total of 1323
    but to get the new average, we must now divide this by 16
    1323/16 = 82.6875 or 83% to the nearest whole number.

  • math exam tommrow review -

    so the average doesnt change?

  • math exam tommrow review -

    Yes the average changed -- from 82 to 82.6875 -- rounded to 83%

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