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What this is showing is that you have a 4.5% chance of getting one of the coveted 10 KM eggs (that house all the best hatch-able Pokemon) from a Pokestop.
95.5% of the time you'll received a 2 or 5 KM egg from Pokestops.
Remember to ONLY use your blue temporary incubators on the 10KM eggs, and the infinite incubator on the 2KM and 5KM eggs.