Cassie buys a rope at the store. The label on the package says that the rope is 3.15 meters in length. She measures the rope as 1.85m. What is her percent error? Show your calculation.

Percent error = 41%

Explanation:

Percent error:

Percent error is the difference between the measured value and actual value divided by actual value multiply by 100.

Given dа ta:

Actual length of rope = 3.15 m

Measured length of rope = 1.85 m

Percent error = ?

Solution:

Formula:

Percent error = [measured value - actual value / actual value ] * 100

Now we will put the values in formula.

Percent error = [1.85 - 3.15 / 3.15 ] * 100

Percent error = [-1.3 / 3.15 ] * 100

Percent error = - 0.41 * 100

Percent error = 41%

The negative sign shows that measured value is less than the actual value but often results are reported in absolute value.