Posted by **ellis** on Tuesday, December 18, 2012 at 8:00pm.

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 -
**Ms. Sue**, Tuesday, December 18, 2012 at 8:04pm
15 * 82 = 1230

1230 + 93 = 1323

1323 / 15 = 82.69

- math exam tommrow review -
**Reiny**, Tuesday, December 18, 2012 at 8:04pm
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 -
**ellis**, Tuesday, December 18, 2012 at 8:20pm
so the average doesnt change?

- math exam tommrow review -
**Ms. Sue**, Tuesday, December 18, 2012 at 8:22pm
Yes the average changed -- from 82 to 82.6875 -- rounded to 83%

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