Homework Answers
Average = (13.13 + 13.14 + 13.13 + 13.08 ) / 4
= 52.48/4
= 13.12
Now let's calculate Variance
13.13 - 13.12 = 0.01
13.14 - 13.12 = 0.02
13.13 - 13.12 = 0.01
13.08 - 13.12 = -0.05
Now let's add the square the differences
= (O.01)2 + (0.02)2 + ( 0.01)2 + (-0.05)2
= 0.0001 + 0.0004 + 0.0001 + 0.0025
= 0.0031
Let's calculate the average of square of differences
Avg. = 0.0031 / 4
= 0.000775
Variance = 0.000775
Standard deviation = √ Variance
Standard Deviation = √ 0.000775
= 0.027
So average measurement is 13.12 ± 0.027
Or 13.12 ± 0.03
Option 4 is correct answer
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