One of the quirks of the ground is occasional acid fog. Only 150grounders are immune to acid fog out of a total of 3000 grounders.For a random group of 250 grounders in an acid fog;
A. (6 points) What is the expected value and standard deviationof the number of survivors? (HINT: It might be useful to thinkabout the Binomial distribution here.) (Your answer here)
B. (8 points) what is the approximate probability that thenumber of survivors is at least 20? (Your answer here)
C. (6 points) Verify the conditions needed to compute theprobability in Part (B) above. (Your answer here)
