The percentage of families with a monthly income of 1,000 or more in city a and city b is 25% and 20% respectively. If a random sample of 100 families is selected from each of these two cities and the proportion of families earning rs. 1,000 or more in the two samples are compared, what is the probability that the city a sample proportion will be greater than that of city b's by 3% or more?

I’m gonna guess without the picture to influence people to join the army

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's. 

Improved travle between colonies and africa