Statistics, option 1

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Objective 1.
In order to study the productivity of turners at an engineering plant was carried out a 10% sample survey of 100 workers by random sampling without replacement selection. As a result, the survey provided data on the cost of processing time for one detail:

The processing time of one detail, min 18 - 20 20 - 22 22 - 24 24 - 26 26 - 28 28 - 30 Total
Number of offers 2 50 12 24 August 4100
Define:
1. The average processing time of one detail.
2. The dispersion and standard deviation.
3. The coefficient of variation

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