Crosstiles, Inc. determines that the breaking strength of the most popular porcelain tile is normally distributed with a mean of 200 pounds per square inch and a standard deviation of 6 pounds per square inch.

a. About what percent of its popular porcelain tile will have breaking strengths of at least 190 pounds per square inch?

b. Describe the breaking strength of the strongest 8% of its popular porcelain tile

c. About what percent of Crosstile’s popular porcelain tile will have breaking points between 185 and 220 pounds per square inch?