Question

100 students were estimated at a

basketball game. 120 students
were actually there. What is the
percent error?

Answer 1

20%

Explanation:

Use the formula:

The "|" symbol represents absolute value and the dashed line represents a division line.

| Theoretical Value - Actual Value |

Percent Error = -------------------------------------------------- × 100

| Theoretical value |

• 100 students is the theoretical value

• 120 students is the actual value

100 - 120 = -20

-20 / 100 = -0.2

|-0.2| = 0.2

0.2 × 100 = 20

The answer is 20%