Rose Harrison and Clara Huizink Solutions for Exercise 10: Practice 3

Elias estimated that $20$ people would attend an evening lecture. In fact, $23$ people attended. Find the percentage error in his estimate. [Enter the value to the nearest integer and excluding percentage symbol]

Markéta bought a $250 \mathrm{g}$ pack of butter. She weighed it to find its actual mass was $240 \mathrm{g}$. Find the percentage difference in mass. Take $250 \mathrm{g}$ as the true value.

Amelia made an $18\%$ error in a calculation. Her incorrect answer is $27.50$. Find two possible correct answers.

A factory produces cereal bars with mass $58 \mathrm{g}$, and percentage error up to $2\%$. Find the range of possible masses of cereal bars from this factory.

Find the measurement that has the largest absolute error.

$500 \mathrm{kg}$ measured with a percentage error of $1\%$  [Enter the value excluding units]

Find the measurement that has the largest absolute error.

$30 \mathrm{kg}$ measured with a percentage error of $10\%$  [Enter the value excluding units]