Question

You earned 88 on unit 1 92 on unit 2 and 87 on unit 3 Write an solve an equation to find the score you need on the fourth test so that your average score is 90

Answer 1

To find the score needed on the fourth test to achieve an average of 90, set up the equation (88 + 92 + 87 + x) / 4 = 90, solve for x, and find that x must be 93.

Step-by-step explanation:

The student has asked how to calculate the score they need on the fourth test to achieve an average score of 90, given their current test scores. To find the required score for the fourth test, we need to set up and solve an equation that represents the average score formula. The average score is calculated by adding all test scores and then dividing by the number of tests.

Let's denote the unknown fourth test score as x. The equation to find x is based on the requirement for an average of 90 over four tests:

(88 + 92 + 87 + x) / 4 = 90

Add the known test scores and multiply both sides of the equation by 4 to solve for x:

267 + x = 360

Subtract 267 from both sides to isolate x:

x = 360 - 267

x = 93

Therefore, the student will need to score 93 on the fourth test to have an average score of 90.