Which student should I choose? I can choose more than one. There is a hint at th

Question

Which student should I choose? I can choose more than one.

There is a hint at the bottom of the picture

The number of trials needed during a laboratory experiment may depend on the precision of the results. For a particular titration lab, each student needs at least two trials that agree within 1% of their average value. Which students need to perform at least one more trial? Student A Student B Student C Start by finding the average molarity (or average volume) for the closest two trials for each student. If the average deviation s more than 1% of the average value, then the student needs to do additional trials. A deviation is the difference between an individual value and the average. The average deviation is simply the average of the deviations. Note that when comparing only two trials, the two deviations will be equal to each other, and to the average deviation. Which student should I choose? I can choose more than one. There is a hint at the bottom of the picture

Explanation / Answer

The averae values for each trial are

1. 0.1382 Percentage deviations are : 0.869 and 0.869 respc

2. 0.1247 Percentage deviations are: 3.048 and -2.958respc

3. 0.1171 Percentage deviations are: -.679 and 0.68respc

So, 1 and 3 trials need to be repeated

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