Maths grade average question

by mistake, an instructr has erased the grade that one of ten students in her class recieved in a final examination. however, she knows that the students (had a mean grade of)71 on the examination, and that the other nine students received grades of 96, 44, 82, 70, 47, 74, 94, 78, and 56. what must have been the grade thatthe teacher erased?
Question asked by: julianna

Asked on: 18 Sep 2010

Add those 9 up and then divide by nine to find the average of those nine.

Then work out what you need to add such that when you divide by 10 you get 71.

There you go, that's the method for you but we've not done all the work so that you can still do a little learning with regard to working this out and not just getting the answer given straight to you - perfect!
By: knowitall
Replied at: 19 Sep 2010
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