Answer: 6 minutes
Step-by-step explanation:
According to the Empirical rule ,
About 68% of the population lies within one standard deviation from the mean.
Given : Suppose the wait 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 percent of travelers will spend between 16 and 28 minutes waiting to pass through immigration.
i.e. Mean - standard deviation= 16
and Mean + standard deviation =28
Since , Mean=22 , so we have
22+ standard deviation =28
⇒ standard deviation =28 -22 =6
Hence, the standard deviation for the wait time through immigration is 6 minutes .
