We know that average number of planes landing at particular airport during an hour is 36.
a) what is the mean time for waiting for the first landing during an hour?
b) find probability of waiting more than 1/2 hour to see the first landing?
I assumed this is Poisson distribution as Exponential is memoryless (each minute would have independent probability, am I right?)
But to be honest I don't really know what to do next. I wrote down the data from the task:
$$\lambda = 36$$
And I'm stuck. Looking more for tips how to solve this task, not full solution.
Thank you for help in advance.