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An economics 101 class a student has scores of 69 84 86 and 87 on the first 405 test to earn a grade of higher the average of the first test scores must be greater than or equal to 80

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Answer:

He must score 74 or higher to get an average that's equal or greater than 80

Step-by-step explanation:

Given:

  • The student has scored 69, 84, 86, 87 on the first four tests
  • There's one more test remaining in the course.
  • To get a higher grade, their overall average needs to be at least 80.

Steps:

1. Let's add up the scores from the first four tests:

69 + 84 + 86 + 87 = 326

2. Let's calculate the total points needed to have an average of 80 or higher for all five tests:

[tex] \sf{80 \times 5 = 400}[/tex]

3. Subtract the total points earned (326) from the target points for an 80 average (400):

400 - 326 = 74

So, the student must score 74 or higher on their fifth test to achieve an average of 80 or greater for the course.

Answer:

[tex] \fbox{ \fbox{ \sf{ 74 $\geqslant $ x $ \leqslant $ 100 }}}[/tex]

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