If the inspection division of a country weights and measures department wants to estimate the mean amount of soft-drink fill in 2-liter bottles to within ±0.01 liter with 90% confidence and also assumes that the standard deviation is 0.05 liter, what sample size is needed?

MATLAB: An Introduction with Applications
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If the inspection division of a country weights and measures department wants to estimate the mean amount of soft-drink fill in 2-liter bottles to within ±0.01 liter with 90% confidence and also assumes that the standard deviation is 0.05 liter, what sample size is needed? 

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