Answer:
1. probability
2. head represents cats (let's say) and tails represent dogs, flip two coins to determine whether the family has 2 cats or 2 dogs or 1 cat and 1 dog.
3. Take two coins, flip them, record heads and tails of each flip for 50 flips (I ain't no doing this)
4 - 6. answer these questions based on the data you got...
The End