The time taken to answer an exam question for a randomly chosen student has a uniform probability distribution from 1 minute to 5 minutes. What is the probability that the time to answer is no more than 2 minutes?
A) 0.20
B) 0.25
C) 0.40
D) 0.75

Question

Quizplus · Accepted Answer

The uniform distribution from 1 to 5 minutes means any time within this range is equally likely. The range is 5 - 1 = 4 minutes. The time "no more than 2 minutes" covers the range from 1 to 2 minutes, which is 1 minute. The probability is the desired range (1 minute) over the total range (4 minutes), so 1/4 = 0.25.

The Time Taken to Answer an Exam Question for a Randomly