The base of the shaded rectangle obtained using the interval represented by the difference in the ages 11.94 years old and 9.92 years old is 2.02
The steps used to find the length of the base of the shaded rectangle can be presented as follows;
The base of the shaded rectangle is the distance between the points 11.94 and 9.92, which can be found as follows;
Base of the shaded rectangle is; 11.94 - 9.92 = 2.02
The base length of the shaded rectangle is about 2.02 units
Please find attached the possible diagram of the unshaded rectangle, created with MS Word, obtained from a similar question found through search