Question

В університеті оцінка за семестр є середнім арифметичним оцінок за 5 тестів, які складають студенти протягом семестру. Найбільша можлива оцінка за кожний тест дорівнює 100 балам. Середня оцінка студентки Марії за чотири складені нею тести становить 88 балів. Скільки балів має отримати Марія за п'ятий тест, щоб її оцінка за семестр становила 90 балів?​

Answer 1

ну я думаю что так я не знаю

Answer 2

Calculation of Maria's Fifth Test Score

To determine how many points Maria needs to score on her fifth test in order to achieve a semester grade of 90 points, we can use the information provided.

Maria's semester grade is calculated as the average of her scores on five tests. The maximum possible score for each test is 100 points. We know that Maria's average score for the first four tests is 88 points.

Let's denote the score Maria needs to achieve on her fifth test as x.

To calculate the average score for all five tests, we can use the formula:

Average = (Sum of all scores) / (Number of scores)

In this case, the sum of all scores is the sum of Maria's scores on the first four tests (88 * 4) plus her score on the fifth test (x). The number of scores is 5.

So, the equation becomes:

90 = (88 * 4 + x) / 5

To solve for x, we can multiply both sides of the equation by 5:

450 = 352 + x

Next, subtract 352 from both sides:

x = 450 - 352

Simplifying the equation:

x = 98

Therefore, Maria needs to score 98 points on her fifth test in order to achieve a semester grade of 90 points.