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Determine the smallest sample size required

Determine the smallest sample size required to estimate the population mean under the following specifications:

a. e = 2.4 confidence level = 80% data between 50 and 150
d. e = 1.2 confidence level = 90%, data between 25 and 175

How do I find the third piece of information to use e= "Ï?" /(â??ð'?)?
How do I estimate the standard deviatiion?

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