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Heather has the following averages in her math class:
Homework Avg.: 88
Quiz Avg.: 84
Test Avg.: 92
Final Exam: ??
If the teachers weights Homework at 20%, Quizzes at 20%,
Tests at 40%, and the Final Exam at 20%, what is the minimum
grade Heather can make on the final exam so that she scores a
90 in the class?

Respuesta :

Answer:

94

Step-by-step explanation:

multiply the averages by their weighted percentage

x = final exam

88(.2) + 84(.2) + 92(.4) + x(.2) = 90

solve for x

x(.2) = 90 - 71.2 = 18.8

divide both sides by 0.2

x = 94

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