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The taxi-in times for 48 flights that landed in Los Angeles have a mean of 11

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The taxi-in times for 48 flights that landed in Los Angeles have a mean of 11.4 min and a standard deviation of 7.0 min. What is the z-score for a taxi-in time of 6 min?
 Consider a sample taken from the population of all taxi-in times for all flights that land in Los Angeles. Identify the symbols used for the sample standard deviation, population standard deviation, sample variance, and population variance.