The time it takes a student to finish a final exam is known to be normally distributed with a mean equal to 84 minutes and a standard deviation equal to 10 minutes. Given this information, the probability that it will take a randomly selected student between 75 and 90 minutes is approximately 0.0902.

Question

Quizplus · Accepted Answer

The probability that it will take a randomly selected student between 75 and 90 minutes is calculated using the normal distribution. The z-scores for 75 and 90 minutes are approximately -0.9 and 0.6, respectively. The probability between these z-scores is approximately 0.5488, not 0.0902.

The Time It Takes a Student to Finish a Final