Halp pl ira makes an a on 80% of his tests. in the next week, ira has 5 final exams. he wants to determine the probability that he makes an a on 4 of the 5 tests. which simulation design has an appropriate device and a correct trial? a) roll a die letting 1 represent ira making an a and 2-6 represent ira not making an a. roll the die four times. b) roll a die letting 1 represent ira making an a and 2-6 represent ira not making an a. roll the die five times. c) using a table of random digits select a digit between 0 and 9. let 0-7 represent ira making an a and 8-9 represent ira not making an a. select four digits. d) using a table of random digits select a digit between 0 and 9. let 0-7 represent ira making an a and 8-9 represent ira not making an a. select five digits. thx