Nine friends each guessed the number of marbles in a jar. when the answer was revealed they found they had guessed well and one was the winner. what was the standard deviation their errors?

Which equation can be simplified to find the inverse of y = 2x2?

The deck that kenneth is building is in the shape of a parallelogram abcd the measure of angle c is one third the measure of angle b find the measure of each angle of the deck

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective