Need list the heights that overlap in the dot plot

Consider the diagram. which line segment has the same measure as st? rx tx sr xs

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”?

Rewrite the expression in z to the n power. the expression i was given is: 1 over z to the negative 1 half power.