Find the standard deviation of the initial sample, Basic Statistics

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Find the standard deviation of the initial sample

Solve the below problem

Q: A time study is to be carried out to establish time standard for a job. The result should be within a confidence level of 95% (z=1.96), with an accuracy of +/- 1.62%. If the mean and standard deviation of the initial sample are 2.1 and 0.32 respectively, how many sampling would be required?

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Basic Statistics: Find the standard deviation of the initial sample

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