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.For the passengers in the SRS,what is the approximate probability that the mean length of time for them to get through security will be less than 18 min?
A)0.378
B)0.186
C)0.031
D)0.314
E)Not within ± 0.005 of any of the above

Question

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.For the passengers in the SRS,what is the approximate probability that the mean length of time for them to get through security will be less than 18 min?
A)0.378 
B)0.186 
C)0.031 
D)0.314 
E)Not within ± 0.005 of any of the above

Quizplus · Accepted Answer

The Answer of 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.For the passengers in the SRS,what is the approximate probability that the mean length of time for them to get through security will be less than 18 min?
A)0.378 
B)0.186 
C)0.031 
D)0.314 
E)Not within ± 0.005 of any of the above

The Length of Time It Takes to Get Through the Security