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anonymous
 5 years ago
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 ?
anonymous
 5 years ago
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 ?

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Averages are found by adding up all the pieces and dividing by the number of terms added...

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0... so (85 + 81+ 82 + 94 + x)/5 = 84 and solve

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0...solve by multiplying both sides by 5 and then subtracting all the numbers on the left from each side

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0because 5 is in the denominator (dividing) on the left, so you "undo" that by multiplying. ...there's another method...

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0whats the other method

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0ok so i came out with 1710=420????/ what did i do wrong

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0oh wait is the answer 68?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0NEVER mind i got the right answer thanks!

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Sorry, 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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