I`m really confused where did the 10 total of frequency came from. Can you explain it to me? Thank you

Example. Give the probability distribution on the random variable X defined as the number of good cellphones drawn from 5 cellphones of which 3 are good ones and 2 are defectives when 3 cellphones are drawn at random. Random variable X- number of good cellphones X- number of good Frequency / Probability cellphones * or P(x] total 10 Let us now find the probability corresponding to a given random variable. 1. What is the probability of getting exactly ? good cellphones?. 3. What is the probability of getting at most 2 good cellphones" 3. What is the probability of getting at least 2 good cellphones