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Lisa's test grades are 79, 89 and 90 b. There will be one more test this year. If Lisa wants her test average to at least be 88, what is the lowest grade she could get on her last test.
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Lisa's test grades are 79, 89 and 90

b. There will be one more test this year. If Lisa wants her test average to at least be 88, what is the lowest grade she could get on her last test.

User Starnetter
by
8.2k points

2 Answers

4 votes
  • Mean=Sum of data/No of data

So

Let that be n

  • n+79+89+90/4=88
  • n+258/4=88
  • n+258=352
  • n=94
User Areeha
by
7.2k points
7 votes

Answer:

94

Explanation:

Equating the mean to the scores :

  • 88 = 79 + 89 + 90 + x / 4
  • 352 = 258 + x
  • x = 94
User Jlguenego
by
7.9k points
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