35. A CFO is looking at how much of a company's resources are spent on computing. He samples companies in the pharmaceutical industry and developed

Hello, in this question I am attaching, there was another question related to it that asked for the number of classes and the number was 6. In this question they're asking for the class length, following the formula of: class length = (largest measurement - smallest measurement / number of classes), the answer does not give me 1.4

Can someone explain me how they got this number?