The Length of Time It Takes to Get Through the Security

question 72

Multiple Choice

The length of time it takes to get through the security checks at a very large urban airport is a random variable with a mean of  = 20.6 minutes and a standard deviation of  = 8.4 minutes.A simple random sample of 36 airline passengers is to be observed going through security.What is the mean of the sampling distribution of the sample mean ?

• A)8.4 minutes
• B)20.6 minutes
• C)1.4 minute
• D)It is close to 20.6 minutes,but we can't be certain without having the data to determine it.
• E)Without knowing the distribution,we don't know what it will be.

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