Martha estimated there were 81 marbles in a jar for a contest. The actual number of marbles in the jar was 103. What was the percent error of Martha's estimation?

21.36%

Step-by-step explanation:

estimated value of marble in a jar for a contest = 81

Actual value of marble in a jar for a contest = 103

Percentage error = [ (exact value - approximate value) / exact value] * 100

=[ (103 - 81) / 103] * 100

= (22 / 103) * 100

= 0.2136 * 100

= 21.36%

21.36 %.

Step-by-step explanation:

Actual number of jar = 103

Martha's estimation = 81

Error = 103 - 81

= 22

% error = error/actual value * 100

= 22/103 * 100

= 21.36 %.