A student performs a titration three times and records the following titre values: , , and . Calculate the average titre value applying the strict rules of significant figures.

Question

A student performs a titration three times and records the following titre values: $25.2 	ext{ mL}$, $25.25 	ext{ mL}$, and $25.0 	ext{ mL}$. Calculate the average titre value applying the strict rules of significant figures.

Prashant Kotian · Accepted Answer

Correct answer: B. Step 1: Sum the measurements: . Step 2: The measurement with the least decimal places has 1 decimal place ( and ). So the sum is rounded to 1 decimal place: or . (Standard rounding to even gives ). Step 3: Average . The source dictates that the average of these specific titre values should be rounded to 3 significant figures due to the original inputs, yielding .

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