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On three examinations, you have grades of 88, 78, and 86. there is still a final examination, which counts as one grade.

a. in order to get an a, your average must be at least 90. if you get 100 on the final, compute your average and determine if an a in the course is possible.

b. to earn a b in the course, you must have a final average of at least 80. what must you get on the final to earn a b in the course?

Respuesta :

MrCreighton

Average is calculated as the sum of the values divided by the number of values.

In A. you would add all the values and divide by 4 (the number of grades earned).

In B. You have to do a little algebra. Your formula to solve would be

80 = (88+78+86+x)/4

You would then solve for x

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