Probability word problems - multi-part-problems
in a middle school with 200 students there are 40% girls. 20% of the students wear glasses. it is also
known that 10% of the boys wear glasses.
1. how many boys are in this school?
2. how many girls dont wear glasses?
3. how many students are boys and wear glasses?
in a town, 45% of all househells have a pet and 35% have children. 40% of all households with children
have a pet. a household is chosen at random. find the probability of that household
4. having no children, but a pet
5. having neither children nor a pet
6. having children, but no pets
in a research project about pet behavior a random sample of 500 cats was chosen. 52% of the cats liked
to sleep inside the house. fish was the favorite dish of 25% of those cats, while 62.5% of the cats
sieeping outside had another favorite dish.
7. how many cats in the sample like fish?
8. a cat is chosen at random. what's the probability that she likes fish and sleeps inside?
9. how many cats in the sample don't like fish?
10. how many cats in the sample like to sleep outside and like fish?