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princessmaddiegigi
09.10.2019 •
Mathematics
Gail needs to earn a c in her geology class. her current test scores are 76, 72, 65, and 73. her final exam is worth 3 test scores. in order to earn a c gail's average must lie between 70 and 79 inclusive. what range of scores can gail receive on the final exam to earn a c in the course?
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Ответ:
Final test score should lie within the range of 21.33 and 36.33
Step-by-step explanation:
Given:
Test scores 76, 72, 65, and 73
Worth of final test score = 3
let the final test score be 'x'
thus,
Final test score = 3x
Now,
The average must lie between 70 and 79
i.e the minimum limit of average is 70 and maximum limit of average is 79
Also,
Average =![\frac{\textup{Sum of all the test scores}}{\textup{Total number of test score}}](/tpl/images/0302/1084/8a041.png)
or
Average =![\frac{\textup{ 76 + 72 + 65 + 73 + 3x}}{\textup{5}}](/tpl/images/0302/1084/e9065.png)
thus,
70 ≤
≤ 79
or
70 × 5 ≤
≤ 79 × 5
350 ≤
≤ 395
or
350 - 286 ≤
≤ 395 - 286
or
64 ≤
≤ 109
or
21.33 ≤ x ≤ 36.33
Hence,
the final test score should lie within the range of 21.33 and 36.33
Ответ:
I don't need help,but I can help others
Step-by-step explanation: