Question

Ann puts a beaker on the scale which shows the mass to be 1.65kg. The actual mass was 1.72 kg. what was the percent error in Ann's reading ?

a)4.2 %
b)-7 %
c)- 4.1%
d)0.7%

Answer 1

Measured reading is 1.65 kg

actual reading was 1.72 kg

error in the reading is 1.72 - 1.65 = 0.07 kg

Now percentage error is given as

`error = (error)/(true reading)*100`

`error = (0.07)/(1.72)*100`

`error = 4.1`

so this is -4.1% error as the measured reading is less than the actual value