Kindly send all answers:

A manufacturer knows that on average 20% of the electric toasters produced require repairs within 1 year after they are sold. When 20 toasters are randomly selected, find appropriate numbers x and y such that

a. the probability that at least x of them will require repairs is less than 0.5;

b. the probability that at least y of them will not re quire repairs is greater than 0.8.

NOTE: THREE DECIMAL PLACES, SEND HANDWRITTEN SOLUTIONS. THANK YOU