Use the Normal to Model the Distribution of Sample Means

question 13

Multiple Choice

Use the Normal to model the distribution of sample means.
-In a metal fabrication process, metal rods are produced that have an average length of 20.5 feet with a standard deviation of 2.3 feet. A quality control specialist collects a
Random sample of 30 rods and measures their lengths. What is the probability of
Observing a sample mean greater than 21 feet?

• A) 0.3830
• B) 0.8830
• C) 0.4778
• D) 0.5222
• E) 0.1170

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Industrial Engineering

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