In your biology class, your final grade is based on several things: Labs are 25%

Question

In your biology class, your final grade is based on several things: Labs are 25%, Exams are 45%, and the Final is 30%. Suppose your lab score is 92%, the scores on three exams are 80, 91, and 90.

a. What is your overall percent before the final? Write your answer in percent form rounded to 2 decimal places.

b. What score do you need on the final in order to receive an A in the class? Assume a standard grading scale. Write your answer in percent form rounded to 2 decimal places.

c. If your final exam score is 85, what is your overall percent in the class? Write your answer in percent form rounded to 2 decimal places.

Explanation / Answer

a)Lab is 25% and you got 23% since your lab score is 92%.
Exams are worth 45% and you basically got 39.15% based on an average of 87% (80,90,91).

So 23%+39.15% = 62.15%
This means you're at 62.15% over the 70% of your total grade.

B)

let the required number = x

and overall percentage to get A = y

hence

62.15 + x * 0.3 = y

y can be 80 or 90 { so put accordingly , i had doubt so , i did not put the value}

solve for x by putting the value of y

c)

85 * 0.30 = 25.5

hence total = 62.15 + 25.5 = 87.65

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