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dybincka [34]
3 years ago
7

I'll mark the first and RIGHT answer brainliest! 20 POINTS

Mathematics
1 answer:
goldenfox [79]3 years ago
7 0

I Believe the correct answer would be 28

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Solve the following system. x-y=2. 3x+z=11. y-2z=-3
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2 years ago
Ed takes five 100-point tests in his algebra class. He scores 87, 85 and 87 points on the first three tests. If the scores of hi
trasher [3.6K]

Answer:

Step-by-step explanation:

When we take an average of something, we have to add up all the data on the somethings and then divide by the number of somethings we have. Ed takes 5 tests, and we have scores for them; we also have his current average. What we don't know for sure are 2 of the 5 test scores, but we have enough to determine what they are.

If one test has a score of x, and the other test is 3 points less than that, the score on that last test is x - 3. Putting all of that together into an average problem:

\frac{87+85+87+x+(x-3)}{5}=90 and simplfiying a bit:

\frac{256+2x}{5}=90. Multiply both sides by 5 to get

256 + 2x = 450; subtract 256 from both sides to get

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x = 97

The one test score was a 97 and the other one, which was 3 less than that, was a 94.

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Answer: (1) mean = 9.46; standard deviation = 3.74

Step-by-step explanation:

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Which line segments of a triangle do you draw to find the centroid of a triangle?
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Check the picture below.

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