STANDARD 6.SP.C.8

Develop a probability model and use it to find probabilities of simple events. Compare probabilities from a model to observed frequencies; if the agreement is not good, explain possible sources of the discrepancy.
a. Develop a uniform probability model by assigning equal probability to all outcomes, and use the model to determine probabilities of simple events.  e.g., The probability of rolling a six-sided fair number cube and landing on a 2 is 1/6.  The probability of landing on an even number is 3/6.
b. Develop a probability model (which may not be uniform) by observing frequencies in data generated from a chance process.  e.g., 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?