Question

Suppose the wait to pass through immigration at JFK Airport in New York is thought to be bell-shaped and symmetrical with a mean of 22 minutes. It is known that 68% of travelers will spend between 16 and 28 minutes waiting to pass through immigration. The standard deviation for the wait time through immigration is__________.

Answer 1

6 minutes

Explanation:

68% of people will lie between one standard deviation from the mean. If the mean is 22, and 1 standard deviation away is 16 or 28, the standard deviation must be six (28-22=6)