Use the 68-95-99

Use the 68-95-99.7 Rule to find probabilities or cutoff values.
-Based on data collected from its production processes, Crosstiles Inc. determines that
The breaking strength of its most popular porcelain tile is normally distributed with a
Mean of 400 pounds per square inch and a standard deviation of 12.5 pounds per square
Inch. Based on the 68-95-99.7 Rule, about what percent of its popular porcelain tile will
Have breaking strengths between 375 and 425 pounds per square inch?

A) 95%
B) 68%
C) 84%
D) 32%
E) 47.5%