4. A landscaping mishap has resulted in a massive fly hatch. Flies enter your flat at the rate of 2 per 10 minute interval. The fly invasion follows a possion distribution. a. What is the probability no flies will enter your flat in a ten minute period. b. What is the probability at least one fly will enter your flat in a 10 minute period. C. What is the probability there will be exactly 3 flies in 15 minutes