SOLUTION: 1)the exam scores are:
70 65 85 80 70
if the mean of the 3 highest scores represents 65% of their grade and the final exam is 35% of their grade,what is the range of grades in o
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70 65 85 80 70
if the mean of the 3 highest scores represents 65% of their grade and the final exam is 35% of their grade,what is the range of grades in o
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Question 52917: 1)the exam scores are:
70 65 85 80 70
if the mean of the 3 highest scores represents 65% of their grade and the final exam is 35% of their grade,what is the range of grades in order to achieve a C in the course. round your final answers to the nearest whole number.remember the highest possible grade on the final is 100.
2)Can this student get an "A" if the highest possible score on the final exam is 100? Assume that the grade ranges are:
A 90 100
B 80 89
C 70 79
D 60 69 Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! 1)the exam scores are:
70 65 85 80 70
if the mean of the 3 highest scores represents 65% of their grade and the final exam is 35% of their grade,what is the range of grades in order to achieve a C in the course. round your final answers to the nearest whole number.remember the highest possible grade on the final is 100.
:
I assume they mean what is the range of the final exam score to get a C from the given scores.
:
Average the 3 highest scores [85 + 80 + 70]/3 = 78 (rounded)
:
The ratio of the scores given to the exam score = 65/35 = 13/7 ratio
13 scores of 78 + 7 exam scores (a total of 20 scores) would accomplish this.
:
Let x = final exam score:
: [(13*78) + 7x]/20 = 70 [lowest av to maintain a C]
: [1014 + 7x] = 1400 [Multiplied equation by 20]
: 7x = 1400 - 1014
: x = 386/7
: x = 55 is the lowest exam score to get a C
:
:
Exam score to get the highest C (79)
:
: [(13*78) + 7x]/20 = 79 [hightest av to maintain a C]
: [1014 + 7x] = 1580 [Multiplied equation by 20]
7x = 1580 - 1014
x = 566/7
x = 81 is the highest exam score to get a C
:
Range of the exam score would be 55 to 81 for a C
:
:
2)Can this student get an "A" if the highest possible score on the final exam is 100? Assume that the grade ranges are:
A 90 100
B 80 89
C 70 79
D 60 69
:
:
Using the same method:
: [(13*78) + 7x]/20 = 90 [lowest av to get an A]
: [1014 + 7x] = 1800 [Multiplied equation by 20]
7x = 1800 - 1014
x = 786/7
x = 112 which is impossible, so No!
