The Poisson distribution — practice question

A survey is carried out to discover how many photos people capture on a one-week holiday and how often they look back at earlier photos. For a randomly chosen person, the probability of taking fewer than $100$ photos is $x$. The probability that these people view past photos at least $3$ times is $0.76$. For those who take at least $100$ photos, the probability that they view past photos fewer than $3$ times is $0.90$. This information is shown in the tree diagram. The probability that a randomly chosen person views past photos fewer than $3$ times is $0.801$.