anonymous
  • anonymous
Ivanna has scored 85, 81, 82, and 94 on her previous four tests. What score does she need on her next test so that her average (mean) is 84 ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Averages are found by adding up all the pieces and dividing by the number of terms added...
anonymous
  • anonymous
... so (85 + 81+ 82 + 94 + x)/5 = 84 and solve
anonymous
  • anonymous
...solve by multiplying both sides by 5 and then subtracting all the numbers on the left from each side

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anonymous
  • anonymous
which is....?
anonymous
  • anonymous
wait why multiply
anonymous
  • anonymous
because 5 is in the denominator (dividing) on the left, so you "undo" that by multiplying. ...there's another method...
anonymous
  • anonymous
whats the other method
anonymous
  • anonymous
ok so i came out with 1710=420????/ what did i do wrong
anonymous
  • anonymous
oh wait is the answer 68?
anonymous
  • anonymous
NEVER mind i got the right answer thanks!
anonymous
  • anonymous
Sorry, I got pulled away, the other method is to keep track of how far above or below 84 each number is: 85 - 84 = 1 81 - 84 = -3 82 - 84 = -2 94 - 84 = 10 Then add up all of these, being careful about negatives = 1 - 3 - 2 + 10 = 6 So Ivanna has 6 extra points, which means she can get 84 - 6 = 78

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