The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50.What is the probability that a student uses fewer than 600 minutes?
A)0
B)0.023
C)0.841
D)0.977

Question

Quizplus · Accepted Answer

To find the probability that a student uses fewer than 600 minutes, we calculate the z-score: z = (600 - 500) / 50 = 2. Using the standard normal distribution table, the probability of z being less than 2 is approximately 0.977.

The Number of Cell Phone Minutes Used by High School