anonymous
  • anonymous
Nadia has an average score of 70 after 5 tests. What is the minimum number of tests that Nadia has to score a 100 on to get the average score to at least 89?
Mathematics
chestercat
  • chestercat
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watchmath
  • watchmath
Let \(n\) be the number needed. So we want to have \(5\cdot70+100n\geq 89(n+5)\) \(350+100n \geq 89n+445\) \(11n\geq 95\) \(n\geq 95/11\) So at least \(n=9\).

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