The mean score on a driving exam for a group of driver's education students is 80 points, with a standard deviation of 5 points. apply chebychev's theorem to the data using kequals2. interpret the results.
at least __ % of the exam scores fall between __ and

Need on this one asap im almost done with this subject

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)