. The probability that a grader will make a marking error on any particular question of a multiple choice exam is .1. If there are ten questions on the exam and questions are marked independently,...

. The probability that a grader will make a marking error on any particular question of a multiple choice

exam is .1. If there are ten questions on the exam and questions are marked independently,

what is the probability that no errors are made? That at least one error is made? If there

are n questions on the exam and the probability of a marking error is p rather than .1, give

expressions for these two probabilities