Find the greatest possible error for the measurement 0.991 g.

Find the percent error of the measurement 4 cm.

Need measure of variability and level of significance.

To find the greatest possible error for a measurement, you need to determine the precision and accuracy of the measuring device or procedure. Since you have not provided any information about the measuring device or procedure used, I will assume that the measurement has a precision of ±0.001 g, which means that the actual value could be up to 0.001 g greater or smaller than the measured value.

In this case, the greatest possible error would be ±0.001 g. Therefore, the greatest possible error for the measurement 0.991 g is ±0.001 g.

To find the percent error of a measurement, you need to compare the difference between the measured value and the accepted or known value with the known value. In this case, the accepted or known value is not provided, so we cannot calculate the percent error. The percent error is usually calculated as the absolute value of the difference between the measured value and the accepted value, divided by the accepted value, multiplied by 100%.