Develop probability models (7.SP.C.7)

Develop a probability model and use it to find probabilities of events. Compare probabilities from a model to observed frequencies; if the agreement is not good, explain possible sources of the discrepancy; and develop a uniform probability model by assigning equal probability to all outcomes, and use the model to determine probabilities of events; and develop a probability model (which may not be uniform) by observing frequencies in data generated from a chance process.