so flaws in metal produced by high temperatures occure at a rate of 1 per 10 square feet. what is the probability that there is 3 or more flaws in a 8 x 5 feet. ok, so I know we need to use poisson disstribution on this, e^-np * np^k/k!. howver, I dont know my np. so 1 per 10 square feet means 1 per 10 x 10 feet....maybe we can say this is the same as .1 per 1 x 1 feet. so how do I put this in terms of 8 x 5 feet?