Time intervals measured by a clock gave the following readings: 1.25 s, 1.24 s, 1.27 s, 1.21 s and 1.28 s. What is the percentage error of the observation?
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Time intervals measured by a clock gave the following readings: 1.25 s, 1.24 s, 1.27 s, 1.21 s and 1.28 s. What is the percentage error of the observation?

G1 Physics · Accepted Answer

Step 1: Mean time = (1.25+1.24+1.27+1.21+1.28)/5 = 1.25 s. Step 2: Mean absolute error = (0+0.01+0.02+0.04+0.03)/5 = 0.02 s. Step 3: Percentage error = (0.02/1.25)×100 = 1.6%. Final: Hence D.