5.An administrator makes errors in her typing randomly at a rate of 3 errors every 1000 wrd

(a) In a document of 2000 wrdfind the probability that the administrator makes 4 or more errors.

The administrator is given an 8000 wrd report to type and she is told that the report will only be accepted if there are 20 or fewer errors.

(b) Use a suitable approximation to calculate the probability that the report is accepted.