Find the critical points and phase portrait. classify each critical point as an attractor, a repeller, or semi-stable. if a solution curve satisfies y(0) = 0.5, it is possible for it to satisfy y(3) =4?

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?