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| Absolute Error and Percentage Relative Error |
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| From the above examples on approximation, we observe that the approximated value may be more or less than the original number. |
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| The difference between these two values is called the absolute error. |
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Absolute Error = Original number - Approximated number |
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| The ratio of the absolute error and the original number expressed in percentage form is called percentage relative error. |
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| The number of students in a school are 640. Find (i) the absolute error. (ii) percentage relative error when the number is approximated to the nearest hundred. |
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| (i) Number of students = 640 |
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| Number of students correct to nearest hundred = 600 |
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Absolute Error = [640 - 600] = 40 |
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(ii) %Relative Error  |
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| = 6.25 % |
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| Ans: (i) 40 (ii) 6.25% |
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