The probability that certain chips used in digital alarm clock will be defective is 0.2. A lap bought 20 of these chips. 1) what is the probability that none of the chips is defective?
2) The operation will be satisfactory if sixteen or more of the chips on the digital alarm clocks are not defective, what is the probability that the digital alarm clocks will be satisfactory.
3 ) If there are thirteen such chips in a given digital alarm clock, what is the probability that at mast ten of them operate satisfactorily ?