Common Core Math 7.sp.7b
Statistics And Probability: Investigate Chance Processes And Develop, Use, And Evaluate Probability Models.
Develop a probability model (which may not be uniform) by observing frequencies in data generated from a chance process. For example, find the approximate probability that a spinning penny will land heads up or that a tossed paper cup will land open-end down. Do the outcomes for the spinning penny appear to be equally likely based on the observed frequencies?