Question

Помогите пожалуйста! На уроке ученик должен решить 8 задач, за каждую из которых он может полу- чить от двух до пяти баллов. За 6 задач его средняя оценка равнялась 4,5 балла. Ка- кой может быть сумма баллов за остальные 2 задачи, чтобы средняя оценка была 4 балла? А.5. Б.6. В.7. Г.8.

Answer 1

если средний бал такой , то в сумме балов 27
чтоб средн. было 4 надо из 8 задач
32 балла
ну и 32-27 = 5 баллов

Answer 2

Problem Analysis

The student needs to solve 8 problems, and each problem can earn them between 2 and 5 points. The average score for 6 problems is 4.5 points. We need to determine the possible total score for the remaining 2 problems in order to achieve an average score of 4 points.

Solution

To find the possible total score for the remaining 2 problems, we can use the given information about the average score for 6 problems.

Let's assume the total score for the remaining 2 problems is x.

The total score for the 6 problems is (6 * 4.5) = 27 points.

The total score for all 8 problems is (27 + x) points.

The average score for all 8 problems should be 4 points.

Therefore, we can set up the following equation:

(27 + x) / 8 = 4

To solve for x, we can multiply both sides of the equation by 8:

27 + x = 32

Now, we can solve for x:

x = 32 - 27 = 5

Therefore, the possible total score for the remaining 2 problems is 5 points.

Answer

The possible total score for the remaining 2 problems is 5 points. Therefore, the correct answer is А. 5.