To increase her average to 88, Leah needs to achieve a higher score on the fourth quiz. Here's how you can calculate the score she needs:
1. Leah's average for the past three quizzes is 84.
2. To find out what Leah needs on the fourth quiz to achieve an average of 88, you can follow these steps:
a. Multiply Leah's current average (84) by the number of quizzes taken (3) to get the total points she has earned so far: 84 * 3 = 252 points.
b. To have an average of 88 after four quizzes, Leah's total points need to be 88 * 4 = 352 points.
c. To find out how many points Leah needs to score on the fourth quiz, subtract the points she has already earned from the total points she needs: 352 - 252 = 100 points.
Therefore, Leah must score 100 points on the fourth quiz to increase her average to 88.
