1. Percent Error Tax/Commission/tip = % Original / Total 100 Mark up/down = % Original 100 Is = % Of 100 Part = % Whole 100 Difference = % Original 100 Difference= % Correct value 100

2. 1.) The Melting Point of a substance is 148.2°C. You found the value to be 145.5°C. Calculate the percent error in your measurement.

3. 2.) A person attempting to lose weight on a diet weighed 175 lb. on a bathroom scale at home. An hour later at the doctor’s office, on a more accurate scale, this person’s weight is recorded as 178 lb. Assuming that there was no real weight change in that hour, what is the percent error for these reading?

4. 3.) The melting point of potassium thiocyanate determined by a student in the laboratory turned out to be 174.5 o C. The accepted value of this melting point is 173.2 o C. What is the percent error in this reading? 4) I expected to get $50 for my birthday, but I only got $35. What was the percentage error?? 5) Jim expected 24 people to turn up for a job interview, but only 18 did. What was the percentage error?