Question

a school principal expects 420 parents to attend the school’s open house each fall. this year, 450 parents actually attend the open house. what is the percent of error in the principal’s expectation of attendance, to the nearest hundredth?
%

Explanation:

Step1: Identify values

Expected = 420, Actual = 450. Error = |Actual - Expected| = |450 - 420| = 30.

Step2: Calculate percent error

Percent Error = $\frac{\text{Error}}{\text{Expected}} \times 100\%$ = $\frac{30}{420} \times 100\%$ ≈ 7.142857...

Step3: Round to nearest hundredth

7.142857... rounded to nearest hundredth is 7.14.

Answer:

7.14