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The federal express parcel delivery company would like to estimate the average delivery times to places...

The federal express parcel delivery company would like to estimate the average delivery times to places within Toronto. A random sample of letters are to be delivered and the number of days for each letter to arrive at its destination is recorded. The measurements are expected to have a standard deviation of 3 days. If the estimate of the mean delivery times is desired to be correct to within 0.5 day with confidence level equal to 0.95, how many letters must be included in the study?

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salution aiven that S o. At35./. Coreidence level th Zis 2 1 963 3 人ニ 138-29 Sample size ah 139

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