### Compute the mean monthly cost

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The results of the 4 independent replications of an (M, L) inventory system for the monthly cost are:  [\$243.71, \$236.36, \$235.78, \$233.89]

• Compute the mean monthly cost with a 95% confidence interval.
• Using the results of part (a) to estimate mean monthly cost within \$7.5, do additional replications needed? If yes how many? If no why?
• Compute the prediction interval and it is limits

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