A computer terminal can pick up an erroneous signal from the keyboard that does not show up on the screen. This creates a silent error that isdifficult to detect. Assume that for a particular keyboard the probability that this will occuris per entry is 1/1000.
(a) In 12000 entries, find the probability that no silent errorsoccur.
(b) In 12000 entries, find the approximate probability that atleast 10 silent errors occur.