You are looking at a thermometer that has a mark for each degree. You are going

Question

You are looking at a thermometer that has a mark for each degree. You are going to write down a number corresponding to the temperature. How will you decide how many significant figures to use in the number? (i.e. Will you report the temperature to the ones place, tenths, hundredths, other?) An article in the newspaper says that a sports reporter used binoculars to estimate that the crowd in a football stadium was 25, 466. This amuses you and you decide to write a short letter to the editor. What will you say? The bank reports your balance is about exist2,000. You decide to write a short letter to the president of the bank. What will you say?

Explanation / Answer

Question 1.

1 mark for each degree

note that there is only 1-2 sig fig.

so for T = 25°C, you must report 25 only

meaning that the last 5 is not exact, i.e. not 25.0

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