Averaging Test Grades

The video tutorial explains how to calculate the score needed on a fifth test to achieve an average of 80% across five tests. It begins with an introduction to the problem, followed by a detailed explanation of how averages are calculated. The instructor sets up an equation to find the unknown score and solves it step-by-step. The tutorial concludes with a verification of the solution, ensuring the calculated score is correct.

What is the main goal of the problem discussed in the video?

• To understand the concept of percentages

• To calculate the total score of all tests

• To determine the score needed on the fifth test to average 80%

• To find the highest score possible

How do you calculate an average score?

• Multiply all scores together

• Add all scores and divide by the number of scores

• Subtract the lowest score from the highest

• Divide the highest score by the lowest

Why is it important to include the unknown score in the average calculation?

• To reduce the number of scores

• To ensure the average is calculated correctly

• To avoid using a calculator

• To make the calculation easier

What is the first step in solving for the unknown score?

• Add all known scores together

• Divide the total by the number of tests

• Subtract the known scores from the total

• Multiply the average by the number of tests

What score does Billy need to achieve on the fifth test to meet his goal?

• 85

• 80

• 86

• 90