Question 805609
33% of all pets sold at a pet store are dogs. One day, 8 people arrive at the )store and purchase pets.(Note: One pet is purchased per person.) 
What is the probability that exactly 5 of them are dogs? 
===============
Binomial Problem with n = 8 and p(dog bought) = 0.33
-----
P(x = 5) = 8C5(0.33)^5*(0.67)^3 = binompdf(8,0.33,5) = 0.0659
======

If the store has only 6 dogs, what is the probability that they have sufficient dogs for sale that day?
------
They can expect that 1/3 of their sales will be dogs.
========= 
Cheers,
Stan H.