If the probability of an event happening is 82/95, what are the odds against it happening?

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”?

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?

27/9=18/x a. x=9 b. x=18 c. x=6 d. x=3