Let x be the observed mean of a random sample of size n from a distributionhaving mean μ and known variance σ2. Find n so that x − σ/4 to x + σ/4 is anapproximate 95% confidence interval for μ.

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Let x be the observed mean of a random sample of size n from a distribution
having mean μ and known variance σ2. Find n so that x − σ/4 to x + σ/4 is an
approximate 95% confidence interval for μ.

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