In statistics a Bell curve is the most common way that the distribution of results is plotted. If you know the mean and the standard deviation you can predict with that distribution with reasonable accuracy.
variance
A frequency distribution plot.
variance
I think the answer is variance
It is one of the key measures of a data set: it shows the value around which the observations are spread out.
A scatter diagram.
A frequency diagram or, for grouped data, an histogram.
Pie Chart
Variance
Pie chart. The entire "pie" shows the whole data set, while each "slice" shows each group of data.circle graphs
A graph that shows proportions of different parts (of a whole) is a Pie chart.
pie chart