Problem: Two students determine the percentage of lead in a sample as a laboratory exercise. The true percentage is 22.52%. The students’ results for three determinations are as follows:1. 22.52, 22.48, 22.542. 22.64, 22.58, 22.62(a) Calculate the average percentage for each set of data, and state which set is the more accurate based on the average.

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We’re being asked to calculate the average percentage for each set of data given and determine which set is more accurate.


The average or mean can be calculated using the following equation:

average=sum of the measurementsnumber of measurements


Calculate the average percentage for each set of data:

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Problem Details

Two students determine the percentage of lead in a sample as a laboratory exercise. The true percentage is 22.52%. The students’ results for three determinations are as follows:
1. 22.52, 22.48, 22.54
2. 22.64, 22.58, 22.62
(a) Calculate the average percentage for each set of data, and state which set is the more accurate based on the average.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Accuracy & Precision concept. If you need more Accuracy & Precision practice, you can also practice Accuracy & Precision practice problems.

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Based on our data, we think this problem is relevant for Professor Marsden's class at CAL.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: The Central Science - Brown 11th Edition. You can also practice Chemistry: The Central Science - Brown 11th Edition practice problems.