Looks like Poisson dist. to me with
Karen supplements her income by making a necklace that she sells online. Orders for the necklace occur randomly at a rate of one per every 8 days, on average. She begins each month by making enough necklaces to get her inventory up to 4 necklaces.
X=number of orders that will come in during the month of April (30 days)
a) distribution name
b) parameter value