I need one line explanation for the answer

A data scientist tracked how many cups of coffee she drank every day at work over the course of a year. She used the data to build a probability distribution where the random variable @ represents the number of cups of coffee she drank on a given day. Here is the partially completed distribution: C 0 2 P(C) ? 0.10 0.85 0.05 Find the missing probability in the table. P(C = 0) =