On the Average, a Student Takes 100 Words/minute Midway Through

Multiple Choice

On the average, a student takes 100 words/minute midway through an advanced court reporting course at the American Institute of Court Reporting. Assuming that the dictation speeds of the students are normally distributed and that the standard deviation is 20 words/minute, what is the probability that a student randomly selected from the course can take dictation at a speed between 90 and 120 words/minute?

A) The probability is 0.6428.
B) The probability is 0.7860.
C) The probability is 0.5328.
D) The probability is 0.5438.