Variance, Standard Deviation and Coefficient of Variation using R

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In this video, how to estimate Variance, Standard Deviation and Coefficient of Variation of numerical data (reading from a file) using R statistical package (command-line).
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Hello everyone.
Could you help me please?

• There are 20 numbers.
• Standard deviation: 5 or 4, 5
• Average(Mean): 3
• Numbers between 1 and 10

Which are these numbers?

Thank you for your interest.
Cordinally

baykurabiyecanavari