Michael, jonathan and two of their friends each ride their bikes to school. if they have an equally-likely chance of arriving first, what is the probability that jonathan will arrive first and michael will arrive second?

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”?