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QUESTION
The time it takes to complete the assembly of an electric toaster is normally distributed with a standard deviation of 4 minutes.
The time it takes to complete the assembly of an electric toaster is normally distributed with a standard deviation of 4 minutes. If we randomly select 21 components, what is the probability that the standard deviation for the time of assembly of these units is less than 4.0 minutes? step by step answer pls.
