The time for a professor to grade a student's homework in statistics is normally distributed with a mean of 12.6 minutes and a standard deviation of 2.5 minutes. What is the probability that randomly selected homework will require less than 16 minutes to grade?
A) 0.1401
B) 0.5910
C) 0.7734
D) 0.9131

Question

Quizplus · Accepted Answer

The Z-score for 16 minutes is (16 - 12.6) / 2.5 = 1.36. Using the standard normal distribution table, the probability of a Z-score less than 1.36 is approximately 0.9131.

The Time for a Professor to Grade a Student's Homework