Mathematics, 11.10.2020 03:01 ghakassim

Your test scores in one class are 80 and 88. What possible scores can you earn on your next test to have a test average between 84 and 89, inclusive?

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The average of your two scores to date is 84. You need the average of these two tests plus the next test to be between 84 and 89.

So, you need to solve for x, where 2/384 + 1/3x = 84. This will give you the lower end of your next test.

And you need to solve for y, where 2/384 + 1/3y= 89. This will give you the higher end of your next test.

The reason for the 2/3 in front of the 84 is because there are two tests there, and the reason for 1/3 in front of the unknowns is because that is just one test. Averages need to be weighted by number of observations.

I won't go through the algebra here, but the answers will be 84 and 99.

Step-by-step explanation:

Answer from: memo1102

84 to 99

Step-by-step explanation:

If the goal for your average is 84, then your test scores total ...

(80-84) +(88-84) = -4 +4 = 0

relative to your desired average. This means your minimum score on the next test will need to be 84 -0 = 84.

If the goal for your average is 89, then your test scores total ...

(80-89) +(88-89) = -9 -1 = -10

relative to your desired average. This means your maximum score on the next test will need to be 89 -(-10) = 99.

To ensure a test average between 84 and 89, your next test score must be between 84 and 99.

Answer from: Quest

Ibelieve that c. recording would work best.

Answer from: Quest

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column

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