She must score an 80.
85*5= 425
425-89-79-83-94= 80
1 and 1/2 is the right one
The mean is the average of the numbers: a calculated "central" value of a set of numbers.
Therefore: If the amount spent on books per month by all her classmates is leveled that amount would be $30
To calculate it: add up all the numbers, then divide by how many numbers there are
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