Twenty students take an exam. Student A scored five out of ten and Student B scored eight out of ten. Every score (1 to 10) is equally likely. What is the chance of a random person out of the people that took the exam scoring higher than Student A, but lower than Student B?
So this is from a very basic quiz, no distributions or anything, just frequencies so far. It is a multiple choice question and the possible values are a) 0.8, b) 0.4, c) 0.2, d) 0.22
The random person would have to score either 6 or 7 and there is a 0.2 chance of falling into that range if scores are equally likely. What throws me off is: why does it matter how many people took the exam? The probability of score 6 or 7 must be 0.2 for the whole population of the world. Or is it that Student A and B are already out of the equation, so we are only counting with 18? But how does that matter? I must be having a mental block - can someone help, pls?