Michelle has an average score of 70 for three tests.
What must she score on the next test to increase her average to 74?
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Answer:
Michelle has to score 86 in the next test.
Step-by-step explanation:
The best way to deal with changing averages is to use the
sum. Use the old average to figure out the total of the first
3 scores:
sum of first 3 scores = 70 × 3
=210.
Use the new average to figure out the total he needs after the 4th score:
sum of 4 th scores: 74 × 4
= 296.
To get her sum from210 to 296
Michelle need to score : 296-210= 86.
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