Part ii. chi-square goodness of fit test (unequal frequencies)
a fast-food restaurant manager decides to test his theory that 48% of customers order hamburgers, 33% order chicken, and 19% order a salad.
during a hour selected at random, the number of orders is recorded as shown in the following table.
order number
hamburger
106
chicken 82
salad 30

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. 

It’s b each orbits at a slower rate than the rate rate which the moon orbits the earth