Student measure the mass of an object to be 187g ,but the accepted mass was 170g.What was the student percentage error?

To calculate the percentage error, we use the formula:

Percentage Error = (|Accepted Value - Measured Value| / Accepted Value) x 100%

In this case, the accepted value is 170g and the measured value is 187g.

Percentage Error = (|170g - 187g| / 170g) x 100%
Percentage Error = (| -17g | / 170g) x 100%
Percentage Error = (17g / 170g) x 100%
Percentage Error = 0.1 x 100%
Percentage Error = 10%

Therefore, the student's percentage error in measuring the mass of the object was 10%.