A person scores 60, 70, and 80 in three exams. What score is needed in the fourt

₹0.0

Question: A person scores 60, 70, and 80 in three exams. What score is needed in the fourth exam to achieve an average of 75?

Options:

Correct Answer: 85

Solution:

Total required for average of 75 = 4 * 75 = 300. Current total = 60 + 70 + 80 = 210. Required score = 300 - 210 = 90.

A person scores 60, 70, and 80 in three exams. What score is needed in the fourth exam to achieve an average of 75?

A person scores 60, 70, and 80 in three exams. What score is needed in the fourth exam to achieve an average of 75?

Step 1: Understand that to find the average score, you need to add all the scores together and then divide by the number of scores.
Step 2: The average score we want is 75, and we will have 4 exams in total.
Step 3: To find the total score needed for an average of 75, multiply 75 by 4 (the number of exams). This gives us 300.
Step 4: Now, add the scores from the first three exams: 60 + 70 + 80. This equals 210.
Step 5: To find out what score is needed on the fourth exam, subtract the current total (210) from the total required (300). So, 300 - 210 equals 90.
Step 6: Therefore, the score needed on the fourth exam is 90.

Average Calculation – Understanding how to calculate the average score by summing the scores and dividing by the number of exams.
Total Score Requirement – Determining the total score needed to achieve a specific average by multiplying the desired average by the number of exams.
Subtraction for Required Score – Finding the required score for the last exam by subtracting the current total from the total required.