Here 0.3 in yellow color means that there are 30% of all the flights were on Airline B and on time.
What do you mean by percentage?
A part or amount in every hundred is defined as a percentage. It's a fraction having a denominator of 100 and is denoted by the sign "%".
In the table given in the question , 0.3 indicates the no. of Flights of Airline B which are on time.
Here 0.3 * 100 = 30%
Hence 30% of flights of Airline B are on time.
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