Concept explainers
SO Two students deterrmne the percen.ge of lead in a sample as a laboratory exercise Thelrue percentage is 22 52% The s.dentsr resul. ler three determinations are as fellows
1 22 52, 22 413, 22 54
220422 58,2262
a Calculate Me average percentage for each set of data and sta. which set is the more accurate based on .e average
b Precision can be Judged by examinrng the average of the devrahons from the average value for that da. (CalcAare the average value for each,. set then calculate the average aue of the absolute deviations of each measurerne. from the average ), Which.. more Precrse9
To determine: The average value of deviation for each set of given data; the set that is more précised.
Answer to Problem 1DE
Solution: The average value of deviation for set
Explanation of Solution
Given The true average value is
The values in set 1:
The values in set 2:
The average deviation can be determined by addition of the differences of all numbers and average of all numbers; and further dividing the outcome by the number of items present in that list.
The average deviation of set
The average deviation of set
Both the sets set
Precision is the comparison of closeness of two or more measurements with each other. The set
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