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I don't understand can someone explain this question step by steo .

I don't understand can someone explain this question step by steo

. A company that manufactures natural fibers claims that their fibers have a mean breaking strength of 40 pounds and a standard deviation of 8 pounds .

if we wish to obtain a 95% confidence interval for mu (u) (the true breaking strength) whose width is 4 pounds , how large a sample should we take ?

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