Hello, I wanted to know if someone corrected this exercise please?

A factory produces electronic tubes of which on average 1% are defective. It is then assumed that the fact that a given tube is defective is a random event of probability 0.01 and that these events linked to the various tubes are independent. Mr. Martin buys 300 tubes. The factory guarantees its tubes at 97%.

1- Let X be the number of defective tubes among the tubes purchased by Mr. Martin. What is the law of X? By what law can we approach it? (We can use the approximation of the binomial law by the Poisson law).

2- Determine the probability that Mr. Martin, after testing his tubes, will return to the factory to enforce the warranty