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Uncertainty Calculation

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A burette reading is recorded as 27.70 cm3 +/- 0.05 cm3. Which of the following could be the actual value?

I  27.68                         

II 27.78

III 27.4

A I and II   B I and III   C II and III   D I, II, III

I'm not how to solve this, but I used the total error equation to dtermine which one had less of an error - that would be the actual value and I got C. Not sure if it's right?

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The absolute uncertainty is +/- 0.05 cm3 which means the actual value lies somewhere between 27.65 and 27.75 cm3. 

I think your option III should read 27.74 cm3. Therefore the answer is I and III. 

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