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Chapter 1, Problem 20

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QUESTION:

Problem 20PE

Express your answers to problems in this section to the correct number of significant figures and proper units.

(a) A person’s blood pressure is measured to be 120 ± 2 mm Hg . What is its percent uncertainty? (b) Assuming the same percent uncertainty, what is the uncertainty in a blood pressure measurement of 80 mm Hg ?

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QUESTION:

Problem 20PE

Express your answers to problems in this section to the correct number of significant figures and proper units.

(a) A person’s blood pressure is measured to be 120 ± 2 mm Hg . What is its percent uncertainty? (b) Assuming the same percent uncertainty, what is the uncertainty in a blood pressure measurement of 80 mm Hg ?

ANSWER:

Solution

Step 1

a) The measured blood pressure is

The percentage of uncertainty =  100%

 The percentage of uncertainty =  100%

The percentage of uncertainty =1.667 %

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