hey all

I need to sample from a fixed population (in this case animals) along a negative exponential distribution of group sizes (on the x axis).

eg. 20,000 animals in total in group sizes that follow a negative exp. distn. (i.e. large number of small groups tailing off exponentially to small number of large groups). The total of all the groups should be the fixed number, 20,000.

Is there any way I can find out, if I sample 1000 times, how many of those samples would produce zeros? i.e. x=0

Please ask if anything is unclear.

Any help would be much appreciated,

ajmac