Monthly data on Air Passengers is always in R and accessed by the command.
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this will create an R object called AP in the memory of R. Your job is to first find how many data items are there and then to create a class-interval frequency table with 7 intervals and plot the information on a histogram and a polygon after including two dummy intervals.
use the width formula to determine suitable round number.
I suggest width wid=75 and LLFCI=100