to pass a course with an A grade, a student ,must have an average of 90 or higher. A students grades on three tests are 93,92 and 83. What is the score the student must get on the nest test to get an A average?

To find the score the student must get on the next test to achieve an A average, we can use the following formula:

(average x number of tests + desired grade) / (number of tests + 1) = desired average

Let's plug in the given values:

(90 x 3 + x) / 4 = 90

Simplifying the equation:

270 + x = 360

Subtracting 270 from both sides:

x = 360 - 270

x = 90

Therefore, the student must score 90 or higher on the next test to achieve an A average.

To find the score that the student must get on the next test to achieve an A average, we need to first calculate the average of the three tests already taken. Then, we can determine the minimum score the student needs on the next test to achieve an average of 90 or higher.

Here's how you can calculate it step by step:

1. Add the scores of the three tests the student has already taken: 93 + 92 + 83 = 268.

2. Divide the sum of the scores by the total number of tests taken so far (which is 3 in this case): 268 / 3 = 89.33.

So, the student's current average is 89.33.

To calculate the minimum score the student needs on the next test, we can use the following formula:

90 = (268 + x) / 4

Here, x represents the score the student needs on the next test.

3. Multiply 90 by 4: 90 * 4 = 360.

4. Subtract the sum of the three tests from 360 to find the minimum score on the next test: 360 - 268 = 92.

Therefore, the student must score at least 92 on the next test to achieve an A average (an average of 90 or higher).

mean = ∑x/n

90 = (92 + 92 + 83 + x)/4

Solve for x.