Question

The scale in April's bathroom reads her mass as being 45 kg. However, the label on the side of the box the scale came in says (in fine print) that it has a 3.0% uncertainty. What is the uncertainty in the scale, in kg?

Answer 1

1.35 kg

Step-by-step explanation:

The uncertainty allows us to know the interval where a measured value is found taking into account the errors that the measurements may have.

Uncertainty is calculated in different ways depending on the type of procedure that is followed. In this case, the value of it is already being given (3%), whose percentage should be applied to the value that the instrument gives us.

Therefore, since the indicated mass is 45 kg, the uncertainty value is calculated as:

45 kg x (3/100) = 1.35 kg