The Weight of a Product Is Measured in Pounds $\sigma$ ² = 100 Lbs

question 70

Multiple Choice

The weight of a product is measured in pounds.A sample of 50 units is taken from a batch.The sample yielded the following results: = 75 lbs. ,but we know that $\sigma$ ² = 100 lbs.Calculate a 95 percent confidence interval for .

• A)[71.25 78.75]
• B)[72.23 77.77]
• C)[47.28 102.72]
• D)[72.67 77.33]

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