Suppose the rate of number of stays patients in a hospital is approximately normally distributed. If 75% of rates are 37 day or less, and if 10% of rates are 23 day or less, then find the distribution mean and standard deviation respectively

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. 

And nobody gets hurt