Suppose That Replacement Times for Washing Machines Are Normally Distributed

question 164

Multiple Choice

Suppose that replacement times for washing machines are normally distributed with a mean of 9.3 years and a standard deviation of 1.1 years. Find the probability that 70 randomly selected washing machines will have a mean replacement time less than 9.1 years.

• A) 0.4357
• B) 0.0714
• C) 0.0643
• D) 0.4286

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