Mark normal-category regions and determine two boundary quantiles.

The heights of certain plants are normally distributed. The plants are classified into three categories. The shortest 12.92% are in category A. The tallest 10.38% are in category C. All the other plants are in category B with heights between r cm and t cm.

1. Complete the following diagram to represent this information.[2]
2. Given that the mean height is 6.84 cm and the standard deviation 0.25 cm, find the value of r and of t.[5]