Can someone help me figure this out?

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

Astudent showed the steps below while solving the inequality |x-4|< 1 by graphing.