In the stem-and-leaf display given below you can find the amount of solvent used in Kg (with leaves in tenths of Kg) in a day by 25 different chemical production operations in a chemical factory. 9 |...

In the stem-and-leaf display given below you can find the amount of solvent used in Kg (with leaves in tenths of Kg) in a day by 25 different chemical production operations in a chemical factory.

  9   |  1 4 7

10   |  0 2 2 3 8

11   |  1 3 5 5 6 6 7 7 7

12   |  2 2 3 4 8 9

13   |  0 2

Given the data above, if a percentage histogram for the solvent data is constructed, using "9.0 but less than 10.0 Kg" as the first class,what percentage of chemical production operations use less than 11 kg of solvent in a day?