Organize and represent categorical, discrete, and measured data in frequency tables, pictographs, scaled bar graphs, line graphs, and line plots, using accurate labels, keys, intervals, and scales, including halves, fourths, and eighths on line plots. Interpret these displays to compare values and frequencies, find totals and differences, identify changes over ordered sequences, and calculate the median, mode, and range for small whole-number data sets. Describe, compare, and express simple probabilities as fractions, conduct repeated chance experiments, and distinguish theoretical probability from experimental results in terms of impossible, unlikely, equally likely, likely, and certain events.