4. A computer salesman averages 2 sales per week ( = 2). Use the Poisson distribution to find the probability that in a randomly selected week the number of computers sold is at least 1 (one or more). Show the result of calculations and circle one of the multiple choice answers. P(X1) = A) 0.3679B) 0.8647 C) 0.7769D) 0.1353