The time that it takes a student to walk from his dorm room to his math classroom has an approximate normal distribution with a mean of 8 minutes and a standard deviation of 0.4 minutes. What is the Probability that the student will take between 8.4 and 9.2 minutes to walk to class? Give your answer As a percentage.
A) 2.5%
B) 15.85%
C) 95%
D) 99.7%
E) None of the above.

Question

Quizplus · Accepted Answer

The Z-scores for 8.4 and 9.2 minutes are 1 and 3, respectively. The probability of a Z-score between 1 and 3 is approximately 15.85%.

The Time That It Takes a Student to Walk from His