задачи на среднее арифметическое.
Никто не знает, где можно взять пяток задач в стиле "После первых четырех экзаменов у Пети было в среднем 80 баллов. Для того, чтобы получить "А", ему надо получить как минимум 92 балла. Сколько ему для этого надо получить на последнем экзамене?"
Придумать самой не предлагать :)
В советской программе такого, кажется, не было.
1. http://math-on-line.com/olympiada-edu/katalog-math-arithm-middle-2.html
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2. The average arithmetic mean score for students in 3 different classes is (70, 73, 76), the number of members in each class correspond to (54,41 and 32) respectively. What is the average arithmetic mean score for all of the students in the 3 classes?
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3. The mean of 29 test scores is 77.8. What is the sum of these test scores?
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4. On the first 4 quizzes of his chemistry class, Kevin got an average score of 85. What does he need on the next quiz to have an overall average of 88?
-------------------------------
5. Luis has taken 6 tests and his average score so far is 88.
If he gets 100, a perfect score, on the remaining 2 tests, what will his new average be?
---------------------------------
6. On the first 3 tests of his chemistry class, Ishaan got an average score of 81. What does he need on the next test to have an overall average of 83?
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7. On the first 5 exams of her history class, Nadia got an average score of 80.
What does she need on the next exam to have an overall average of 82?
----------------------------------
8. On the first 6 exams of his history class, Ishaan got an average score of 77. What does he need on the next exam to have an overall average of 80?
---------------------------------
9. On the first 6 exams of his Spanish class, Omar got an average score of 86.What does he need on the next exam to have an overall average of 88?
https://www.khanacademy.org/math/probability/descriptive-statistics/central_tendency/e/average_word_problems?exid=average_word_problems
Придумать самой не предлагать :)
В советской программе такого, кажется, не было.
1. http://math-on-line.com/olympiada-edu/katalog-math-arithm-middle-2.html
---------------------
2. The average arithmetic mean score for students in 3 different classes is (70, 73, 76), the number of members in each class correspond to (54,41 and 32) respectively. What is the average arithmetic mean score for all of the students in the 3 classes?
------------------------
3. The mean of 29 test scores is 77.8. What is the sum of these test scores?
--------------------------
4. On the first 4 quizzes of his chemistry class, Kevin got an average score of 85. What does he need on the next quiz to have an overall average of 88?
-------------------------------
5. Luis has taken 6 tests and his average score so far is 88.
If he gets 100, a perfect score, on the remaining 2 tests, what will his new average be?
---------------------------------
6. On the first 3 tests of his chemistry class, Ishaan got an average score of 81. What does he need on the next test to have an overall average of 83?
-----------------------------------
7. On the first 5 exams of her history class, Nadia got an average score of 80.
What does she need on the next exam to have an overall average of 82?
----------------------------------
8. On the first 6 exams of his history class, Ishaan got an average score of 77. What does he need on the next exam to have an overall average of 80?
---------------------------------
9. On the first 6 exams of his Spanish class, Omar got an average score of 86.What does he need on the next exam to have an overall average of 88?
https://www.khanacademy.org/math/probability/descriptive-statistics/central_tendency/e/average_word_problems?exid=average_word_problems