If your question is deeper see Charles' queries. However, if you just don't understand the notation, 2.4x10^3. cfu/g means that they found 2,400 yeast or mold colonies per gram of the product tested. It reads "two-point-four times ten to the 3rd power".
As to what implications that number has on the testing you were performing, we need a lot more information on why you were performing the testing, what the goals were, how the sample was collected/held, etc.
QA Manager and food safety blogger in Oregon, USA.
Interested in more information on food safety and science? Check out Furfarmandfork.com for more insights!
Subscribe to have one post per week delivered straight to your inbox.