Below is the table From Exercise 2 showing the number of fights at US airports that were delayed on the tarmac for more than three hours before departure during a recent 12-month period

Month                         Delayed Flights

March………………..             85

April………………..               74

May………………..                34

June………………..               268

July………………..                161

August……………                 66

September…………               6

October……………                 11

November…………                4

December…………                  34

January…………                      20

February…………                    60

a. Show the box plot and use the “1.5 x inter-quartile range” approach to identify any outliers. 

b. Use the “3-standard-deviation” approach to identify any outliers. (The standard deviation of the delay data is 73.5 fights.)

c. Calculate the z-score or the value 268.