Astudent reports that, of a simple random sample of 50 college u undergraduate students, 21 % were taking more than fifteen credit hours we know that the student has made mistake (or maybe really did not conduct the survey). why? a) there are . 5 0 students in the sample, so percentages should be multiples of 2% b) there are 50 students in the sample, so percentages should be multiples of 0.02% c) d) 21% of 50 students is 10.5 students, and you cannot sample a fraction of a student. both a and c are correct. e) both b and c are correct