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%
Answer This Question
Related Questions
 Math  A class of 12 students has taken an exam, and the mean of their scores is...
 Research and Statistics  I want to ensure I've done this problem correctly. ...
 Math  On a test whose distribution is approximately normal with a mean of 50 ...
 hard math  42 students took a test in school where the passing score was 70. ...
 math algebra  42 students took a test in school where the passing score was 70...
 math  42 students took a test in school where the passing score was 70. the ...
 math  42 students took a test in school where the passing score was 70. the ...
 math  42 students took a test in school where the passing score was 70. the ...
 Stasistic  On a test whose distribution is approximately normal with a mean of ...
 Math Statistics  Answer the following. Show your work to get credit. Exam ...
More Related Questions