Problem 2 (+15pts). A manufacturer knows that on average 10% of the electric toasters pro- duced require repairs within 1 year after they are sold. When 250 toasters are randomly selected, nd, (a) the exact formula for the probability that 200 of them will require repairs (do not simplify); (b) an approximate probability that at least 150 of them will not require repairs; use the std. normal approximation and justify why it can be used. (0) nd a: such that the probability that at least m toasters will not require repairs is x 0.7517, use the standard normal approximation. Use the tables of appropriate distributions