Use the 68-95-99.7 Rule to find probabilities or cutoff values.
-The time it takes to process phone orders in a small florist / gift shop is normally
Distributed with a mean of 6 minutes and a standard deviation of 1.24 minutes. What
Cutoff value would separate the 2.5% of orders that take the most time to process?
A) 3.52 minutes
B) 4.76 minutes
C) 8.48 minutes
D) 10.01 minutes
E) 11.98 minutes

Question

Quizplus · Accepted Answer

According to the 68-95-99.7 Rule, 95% of data falls within two standard deviations from the mean. Therefore, 2.5% of data lies beyond two standard deviations above the mean. Calculating this: 6 + (2 * 1.24) = 8.48 minutes.