2024 AMC 10A Problem 12

Problem 12 of 25IntermediateProbability & Statistics

Zelda played the Adventures of Math game on August

1

and scored

1700

points. She continued to play daily over the next

5

days. The bar chart below shows the daily change in her score compared to the day before. (For example, Zelda’s score on August

2

was

1700 + 80 = 1780

points.) What was Zelda’s average score in points over the

6

days?

Show solution

Solution

Apply the daily changes

+80, -90, -10, +60, -40

to the starting

1700.

The six scores are

1700, 1780, 1690,

1680, 1740, 1700.

They add to

10290,

so the average is

\frac{10290}{6} = 1715.

Therefore, the answer is E.

Tagged: data and graph interpretation · mean