how to solve these problems

One day at the dog park, John counted 127 dogs, of which 52 were off leash playing. Of the 52, 10 were Retrievers. He saw a total of 35 Retrievers. Using this information complete the contingency table below. Then use it to find the probabilities. Reduce all fractions and use / for the fraction bar. Not on a Leash Leashed Total total dogs 52 75 127 Not a Retriever 42 50 92 Total 10 25 35 1. Are the events not on a leash and retriever independent? No 2. What is the probability that a dog that is a Retriever is on a leash? PC R and L + 25/12 3. What is the probability that a dog that is not on a leash is not a Retriever? P( L'or R' 42/127 4. What is the probability that a dog is not a Retriever and on a leash