I can see a possible mix up between varieties of Arabic here. For example with Jordan there's no way the number of Arabic speakers is below 90%. Egypt is even higher, when I checked on an earlier quiz I got 99% Arabic speakers.
Shouldn't Israel also be on the list? According to Wikipedia and multiple other sources, Arabic is natively spoken by more than 20% of the population, which is more than 1.5mil people.
that would mean Chad has over 70 mil people, but it really is closer to 16 mil